优化移除源时的行为

src/renderer/views/Setting/components/UserApiModal.vue

@@ -84,6 +84,7 @@ export default {
       if (!api) return
       if (appSetting['common.apiSource'] == api.id) {
         let backApi = apiSourceInfo.find(api => !api.disabled)
+        if (!backApi) backApi = userApi.list[0]
         updateSetting({ 'common.apiSource': backApi?.id ?? '' })
       }
       userApi.list = await removeUserApi([api.id])