修改ApiSelect的isFirstLoaded赋值逻辑，只有当加载报错时才需要恢复未初次加载状态

[SunsetSail]

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当指定了immediate：false时，每次点击组件都会触发一次加载方法，这里只需要在加载失败时才需要重新加载。否则不需要重新调用接口。
测试代码

      {
        field: 'SupplierID',
        component: 'ApiSelect',
        label: '供应商',
        required: true,
        componentProps: {
          immediate: false,
          placeholder: '请输入',
          api: SupplierOptionsListApi,
          resultField: 'list',
        },
      },

[wangjue666]

nice catch!