Android: Make the in-game menu scrollbar wider

It was still rather hard to notice, even with autohide disabled.

Source/Android/app/src/main/res/layout/fragment_ingame_menu.xml

@@ -23,6 +23,7 @@
         android:layout_width="match_parent"
         android:layout_height="0dp"
         android:layout_weight="1"
+        android:scrollbarSize="8dp"
         android:fadeScrollbars="false">
 
         <LinearLayout