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/guide3.prefab

@@ -402,7 +402,7 @@
     "_lpos": {
       "__type__": "cc.Vec3",
       "x": 0,
-      "y": 248.35000000000002,
+      "y": -216.83000000000004,
       "z": 0
     },
     "_lrot": {
@@ -743,7 +743,7 @@
       "b": 255,
       "a": 255
     },
-    "_string": "选中卡牌向上滑动，召唤英雄",
+    "_string": "上划或点击召唤英雄",
     "_horizontalAlign": 1,
     "_verticalAlign": 1,
     "_actualFontSize": 41,
@@ -1219,7 +1219,7 @@
     "_left": 0,
     "_right": 0,
     "_top": 590,
-    "_bottom": 788.35,
+    "_bottom": 323.16999999999996,
     "_horizontalCenter": 0,
     "_verticalCenter": 0,
     "_isAbsLeft": true,
@@ -1344,7 +1344,6 @@
     },
     "fileId": "6dh4o/8p1Cy5An1p6o4Bc3",
     "instance": null,
-    "targetOverrides": null,
     "nestedPrefabInstanceRoots": [
       {
         "__id__": 17