Fix top padding in sources tab

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

@@ -9,7 +9,6 @@
         android:id="@+id/recycler"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
-        android:layout_marginTop="4dp"
         tools:listitem="@layout/source_main_controller_card" />
 
     <eu.davidea.fastscroller.FastScroller