[공통][Common] 메인 플레이스홀더 하위 API에서 start, end 작동 x 수정

app/src/main/res/drawable/image_loading_main.xml

@@ -1,7 +1,7 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0"
+  encoding="utf-8"?>
 <layer-list
-  xmlns:android="http://schemas.android.com/apk/res/android"
-  xmlns:app="http://schemas.android.com/apk/res-auto">
+  xmlns:android="http://schemas.android.com/apk/res/android">
   <item>
     <shape>
       <size
@@ -9,9 +9,11 @@
         android:height="@dimen/main_contents_image_height"/>
       <solid android:color="@color/CF6F6F6"/>
     </shape>
-    <bitmap
-      android:gravity="center"
-      android:src="@drawable/bi"/>
   </item>
-
-</layer-list>
+  <item
+    android:bottom="141dp"
+    android:drawable="@drawable/bi"
+    android:left="130dp"
+    android:right="130dp"
+    android:top="141dp"/>
+</layer-list>