stop menu button (or "action bar overflow") from being invisible on

tablet devices.

xwords4/android/XWords4/AndroidManifest.xml

@@ -107,7 +107,6 @@
               />
 
     <activity android:name="BoardActivity"
-              android:theme="@android:style/Theme.Light"
               android:screenOrientation="portrait"
               android:configChanges="keyboardHidden"
               />

xwords4/android/XWords4/res/layout/board.xml

@@ -1,6 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+              android:id="@+id/board_root"
               android:orientation="vertical"
               android:layout_width="fill_parent" 
               android:layout_height="fill_parent"

xwords4/android/XWords4/src/org/eehouse/android/xw4/BoardActivity.java

@@ -2122,7 +2122,7 @@ public class BoardActivity extends XWActivity
     {
         int back = CommonPrefs.get( this )
             .otherColors[CommonPrefs.COLOR_BACKGRND];
-        m_view.getRootView().setBackgroundColor( back );
+        findViewById(R.id.board_root).setBackgroundColor( back );
     }
 
     private void setKeepScreenOn()