fix ui datasource dialog visible. (#4597)

dolphinscheduler-ui/src/js/conf/home/pages/datasource/pages/list/index.vue

@@ -22,6 +22,7 @@
           <el-button size="mini" @click="_create('')">{{$t('Create Datasource')}}</el-button>
           <el-dialog
             :title="item ?($t('Edit')+$t('Datasource')) : ($t('Create')+$t('Datasource'))"
+            v-if="dialogVisible"
             :visible.sync="dialogVisible"
             width="auto"
             :append-to-body="true">