界面开关动画根节点命名统一: content（弹窗类型）

assets/package/prefab/login/Bulletin.prefab

@@ -749,7 +749,7 @@
   },
   {
     "__type__": "cc.Node",
-    "_name": "bg",
+    "_name": "content",
     "_objFlags": 0,
     "__editorExtras__": {},
     "_parent": {

assets/sub_bundle/mail/prefab/MailDetail.prefab

@@ -749,7 +749,7 @@
   },
   {
     "__type__": "cc.Node",
-    "_name": "bg",
+    "_name": "content",
     "_objFlags": 0,
     "__editorExtras__": {},
     "_parent": {

assets/sub_bundle/mail/prefab/MailMain.prefab

@@ -38,10 +38,13 @@
       },
       {
         "__id__": 223
+      },
+      {
+        "__id__": 225
       }
     ],
     "_prefab": {
-      "__id__": 225
+      "__id__": 227
     },
     "_lpos": {
       "__type__": "cc.Vec3",
@@ -746,7 +749,7 @@
   },
   {
     "__type__": "cc.Node",
-    "_name": "bg",
+    "_name": "content",
     "_objFlags": 0,
     "__editorExtras__": {},
     "_parent": {
@@ -5302,6 +5305,30 @@
     "__type__": "cc.CompPrefabInfo",
     "fileId": "c0gT/6ji9PTJX0ec5J0VZd"
   },
+  {
+    "__type__": "cc.Animation",
+    "_name": "",
+    "_objFlags": 0,
+    "__editorExtras__": {},
+    "node": {
+      "__id__": 1
+    },
+    "_enabled": true,
+    "__prefab": {
+      "__id__": 226
+    },
+    "playOnLoad": false,
+    "_clips": [
+      null,
+      null
+    ],
+    "_defaultClip": null,
+    "_id": ""
+  },
+  {
+    "__type__": "cc.CompPrefabInfo",
+    "fileId": "83iuxSJuJIRIFlJVAZD8ix"
+  },
   {
     "__type__": "cc.PrefabInfo",
     "root": {