fix(form:utils): replace getEnum with getCopyEnum in getData

[xucr11]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/ng-alain/delon/blob/master/CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[x] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] Application (the showcase website) / infrastructure changes
[ ] Other... Please describe:

What is the current behavior?

• 【受益人银行所在国家】和【受益人所在国家】都是下拉框，并且用了同样的异步数据源
• 【受益人所在国家】设置了 readOnly: true，导致【受益人银行所在国家】下拉框的数据受到影响
• 希望在底层用deepCopy解决

// html
        depositcountry: {
          type: "string",
          title: "受益人银行所在国家",
          ui: {
            widget: "select",
            allowClear: true,
            placeholder: "请选择",
            optionalHelp: "系统会根据所选国家判断是境内账户或境外账户",
            showRequired: true,
            showSearch: true,
            serverSearch: true,
            asyncData: (): Observable<SFSchemaEnum[]> => {
              return this.fetchDataMixin.getDepositCountry()
            },
            onSearch: (keyword: string): Promise<SFSchemaEnum[]> => {
              return this.fetchDataMixin.getDepositCountry(keyword).toPromise()
            },
            change: () => {
              this.schemaDynamicMixin.initDynamicSchema()
            },
          },
        },
        country: {
          type: "string",
          title: "受益人所在国家",
          readOnly: true,
          default: "CHN",
          ui: {
            widget: "select",
            allowClear: true,
            placeholder: "请选择",
            showRequired: true,
            showSearch: true,
            serverSearch: true,
            asyncData: (): Observable<SFSchemaEnum[]> => {
              return this.fetchDataMixin.getDepositCountry()
            },
            onSearch: (keyword: string): Promise<SFSchemaEnum[]> => {
              return this.fetchDataMixin.getDepositCountry(keyword).toPromise()
            },
            change: () => {
              this.schemaDynamicMixin.initDynamicSchema()
            },
          },
        },

// ts
  public getDepositCountry(keyword?: string): Observable<SFSchemaEnum[]> {
    const obs = this.countryCodeList?.length
      ? of(this.countryCodeList)
      : this.apiService.getOverseasCountryCodeListUsingGET().pipe(
        map(({ data = [] }) => {
          this.countryCodeList = data.map((item) => {
            return {
              ...item,
              label: item.desc,
              value: item.code,
            } as SFSchemaEnum
          })
          return this.countryCodeList
        }),
      )
    return obs.pipe(
      map((list) => {
        if (!keyword) { return list }
        return list.filter((item) => item?.label?.includes(keyword) || item?.value?.includes(keyword))
      }),
    )
  }

What is the new behavior?

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.99%. Comparing base (f359731) to head (ce20b5b).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff            @@
##           master    #1890    +/-   ##
========================================
  Coverage   94.99%   94.99%            
========================================
  Files         273      273            
  Lines        8846     8846            
  Branches     1711     1811   +100     
========================================
  Hits         8403     8403            
  Misses        365      365            
  Partials       78       78            

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