merge fix_notification_icon_size into master

修复状态栏通知应用的图标太大的问题

Created-by: zhaolu28
Commit-by: zhaolu28
Merged-by: openharmony_ci
Description: ### 一、内容说明（相关的Issue）
https://gitcode.com/openharmony/applications_systemui/issues/598

将状态栏通知应用的图标宽高改为12vp


See merge request: openharmony/applications_systemui!560

features/statusbarcomponent/src/main/resources/base/element/float.json

@@ -34,11 +34,11 @@
     },
     {
       "name": "status_bar_notification_icon_width",
-      "value": "24vp"
+      "value": "12vp"
     },
     {
       "name": "status_bar_notification_icon_height",
-      "value": "24vp"
+      "value": "12vp"
     },
     {
       "name": "status_bar_notification_icon_space",
@@ -57,4 +57,4 @@
       "value": "3vp"
     }
   ]
-}
+}