fix(ui prefab): 调整引导UI位置、文案与样式

1. 修正guide1、guide3、guide4的控件垂直位置
2. 更新guide3的引导提示文案
3. 调整sbox的多处控件颜色为深灰色
4. 移除部分prefab的冗余targetOverrides字段

assets/resources/gui/element/guide4.prefab

@@ -406,7 +406,7 @@
     "_lpos": {
       "__type__": "cc.Vec3",
       "x": 0,
-      "y": 0,
+      "y": -307.501,
       "z": 0
     },
     "_lrot": {
@@ -1348,7 +1348,6 @@
     },
     "fileId": "6dh4o/8p1Cy5An1p6o4Bc3",
     "instance": null,
-    "targetOverrides": null,
     "nestedPrefabInstanceRoots": [
       {
         "__id__": 17