android: remove preferences menu item for now.

The preferences activity doesn't work, so easiest not to try to use
it until it is properly implemented.

Change-Id: I4b4195f6dcafa3c99dbef1ae3044ea18ab173c21

android/experimental/LOAndroid3/res/menu/view_menu.xml

@@ -11,6 +11,4 @@
           android:title="@string/menu_sort_az"/>
     <item android:id="@+id/menu_sort_modified"
           android:title="@string/menu_sort_modified"/>
-	<item android:id="@+id/menu_preferences"
-          android:title="@string/menu_preferences"/>
 </menu>

android/experimental/LOAndroid3/src/java/org/libreoffice/ui/LibreOfficeUIActivity.java

@@ -277,9 +277,6 @@ public class LibreOfficeUIActivity extends Activity implements ActionBar.OnNavig
             case R.id.menu_sort_modified:
                 sortFiles(item);
                 break;
-            case R.id.menu_preferences:
-                editPreferences(item);
-                break;
             default:
                 return super.onOptionsItemSelected(item);
         }