update 生活号选择页面屏蔽返回按钮

Components/newscontent/src/main/res/layout/activity_life_account_identity.xml

@@ -2,12 +2,12 @@
 <RelativeLayout
     xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
-    android:layout_height="match_parent">
+    android:layout_height="match_parent"
+    android:fitsSystemWindows="true">
 
     <LinearLayout
         android:layout_width="match_parent"
         android:layout_height="match_parent"
-        android:layout_marginTop="44dp"
         android:layout_marginBottom="95dp"
         android:orientation="vertical">
 
@@ -23,7 +23,8 @@
                 android:background="@null"
                 android:paddingStart="20dp"
                 android:scaleType="fitCenter"
-                android:src="@drawable/selector_big_back_black_button" />
+                android:src="@drawable/selector_big_back_black_button"
+                android:visibility="gone"/>
 
             <TextView
                 android:id="@+id/title"