remove redundant background color from layout

Author: thestinger

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

@@ -5,7 +5,6 @@
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
-    android:background="?android:attr/colorBackground"
     android:orientation="vertical">
 
 
@@ -47,4 +46,4 @@
             android:text="@string/outline_not_available"
             android:visibility="gone" />
     </FrameLayout>
-</LinearLayout>
+</LinearLayout>