Add unused xmlns

Author: brarcher

app/src/main/res/layout/activity_main.xml

@@ -1,7 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
-    xmlns:rsb="http://schemas.android.com/apk/res-auto"
     android:id="@+id/mainlayout"
     android:layout_width="match_parent"
     android:layout_height="match_parent"