feat(frontend):分组、场景pid修改为0

frontend/src/views/dataset/common/DatasetGroupSelector.vue

@@ -146,7 +146,7 @@ export default {
       expandedArray: [],
       groupForm: {
         name: '',
-        pid: null,
+        pid: '0',
         level: 0,
         type: '',
         children: [],
@@ -201,7 +201,7 @@ export default {
       this.editGroup = false
       this.groupForm = {
         name: '',
-        pid: null,
+        pid: '0',
         level: 0,
         type: '',
         children: [],

frontend/src/views/dataset/group/DsMoveSelector.vue

@@ -36,7 +36,7 @@ export default {
       currGroup: '',
       groupForm: {
         name: '',
-        pid: null,
+        pid: '0',
         level: 0,
         type: '',
         children: [],

frontend/src/views/dataset/group/GroupMoveSelector.vue

@@ -36,7 +36,7 @@ export default {
       currGroup: '',
       groupForm: {
         name: '',
-        pid: null,
+        pid: '0',
         level: 0,
         type: 'group',
         children: [],