Android: Ensure menu is always wide enough

25% of the screen isn't necessarily wide enough on phones,
especially not in portrait mode.

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

@@ -22,16 +22,14 @@
 
         <FrameLayout
             android:id="@+id/frame_menu"
-            android:layout_width="0dp"
+            android:layout_width="260dp"
             android:layout_height="match_parent"
-            android:layout_weight=".25"
             tools:layout="@layout/fragment_ingame_menu"/>
 
         <FrameLayout
             android:id="@+id/frame_submenu"
-            android:layout_width="0dp"
-            android:layout_height="match_parent"
-            android:layout_weight=".75"/>
+            android:layout_width="match_parent"
+            android:layout_height="match_parent"/>
 
     </LinearLayout>