refactor(gui): 移除废弃的图集资源并重置精灵帧引用

1. 删除了不再使用的uicons.png资源及其meta文件
2. 将多个prefab文件中的spriteFrame和atlas引用替换为null
3. 修正了prefab_talent_item.prefab中的sizeMode参数

assets/resources/gui/element/card.prefab

@@ -2216,10 +2216,7 @@
     "_fillRange": 0,
     "_isTrimmedMode": true,
     "_useGrayscale": false,
-    "_atlas": {
-      "__uuid__": "031877cb-0f3d-4e92-bc5d-e492a0d95a08",
-      "__expectedType__": "cc.SpriteAtlas"
-    },
+    "_atlas": null,
     "_id": ""
   },
   {

assets/resources/gui/element/ebox.prefab

@@ -2148,10 +2148,7 @@
       "b": 255,
       "a": 255
     },
-    "_spriteFrame": {
-      "__uuid__": "031877cb-0f3d-4e92-bc5d-e492a0d95a08@d17da",
-      "__expectedType__": "cc.SpriteFrame"
-    },
+    "_spriteFrame": null,
     "_type": 1,
     "_fillType": 0,
     "_sizeMode": 0,
@@ -2164,10 +2161,7 @@
     "_fillRange": 0,
     "_isTrimmedMode": true,
     "_useGrayscale": false,
-    "_atlas": {
-      "__uuid__": "031877cb-0f3d-4e92-bc5d-e492a0d95a08",
-      "__expectedType__": "cc.SpriteAtlas"
-    },
+    "_atlas": null,
     "_id": ""
   },
   {

assets/resources/gui/element/heros.prefab

@@ -3111,10 +3111,7 @@
       "b": 255,
       "a": 255
     },
-    "_spriteFrame": {
-      "__uuid__": "031877cb-0f3d-4e92-bc5d-e492a0d95a08@f8e94",
-      "__expectedType__": "cc.SpriteFrame"
-    },
+    "_spriteFrame": null,
     "_type": 0,
     "_fillType": 0,
     "_sizeMode": 1,
@@ -3127,10 +3124,7 @@
     "_fillRange": 0,
     "_isTrimmedMode": true,
     "_useGrayscale": false,
-    "_atlas": {
-      "__uuid__": "031877cb-0f3d-4e92-bc5d-e492a0d95a08",
-      "__expectedType__": "cc.SpriteAtlas"
-    },
+    "_atlas": null,
     "_id": ""
   },
   {

assets/resources/gui/element/prefab_talent_item.prefab

@@ -890,13 +890,10 @@
       "b": 255,
       "a": 255
     },
-    "_spriteFrame": {
-      "__uuid__": "031877cb-0f3d-4e92-bc5d-e492a0d95a08@f8e94",
-      "__expectedType__": "cc.SpriteFrame"
-    },
+    "_spriteFrame": null,
     "_type": 0,
     "_fillType": 0,
-    "_sizeMode": 1,
+    "_sizeMode": 0,
     "_fillCenter": {
       "__type__": "cc.Vec2",
       "x": 0,
@@ -906,10 +903,7 @@
     "_fillRange": 0,
     "_isTrimmedMode": true,
     "_useGrayscale": false,
-    "_atlas": {
-      "__uuid__": "031877cb-0f3d-4e92-bc5d-e492a0d95a08",
-      "__expectedType__": "cc.SpriteAtlas"
-    },
+    "_atlas": null,
     "_id": ""
   },
   {

assets/resources/gui/uicons.png.meta

@@ -1,42 +0,0 @@
-{
-  "ver": "1.0.27",
-  "importer": "image",
-  "imported": true,
-  "uuid": "40479696-ca72-452e-b4c9-42d708361c6d",
-  "files": [
-    ".json",
-    ".png"
-  ],
-  "subMetas": {
-    "6c48a": {
-      "importer": "texture",
-      "uuid": "40479696-ca72-452e-b4c9-42d708361c6d@6c48a",
-      "displayName": "uicons",
-      "id": "6c48a",
-      "name": "texture",
-      "userData": {
-        "wrapModeS": "repeat",
-        "wrapModeT": "repeat",
-        "minfilter": "linear",
-        "magfilter": "linear",
-        "mipfilter": "none",
-        "anisotropy": 0,
-        "isUuid": true,
-        "imageUuidOrDatabaseUri": "40479696-ca72-452e-b4c9-42d708361c6d",
-        "visible": false
-      },
-      "ver": "1.0.22",
-      "imported": true,
-      "files": [
-        ".json"
-      ],
-      "subMetas": {}
-    }
-  },
-  "userData": {
-    "type": "texture",
-    "hasAlpha": true,
-    "fixAlphaTransparencyArtifacts": false,
-    "redirect": "40479696-ca72-452e-b4c9-42d708361c6d@6c48a"
-  }
-}