Return true when we toggle the drawer

The docs say we can check the return value from
ActionBarDrawerToggle#onOptionsItemSelected(MenuItem) to
short-circuit Activity#onOptionsItemSelected(MenuItem), but we were
never returning true.

Change-Id: Ieadc469e65189c27182ed5b28ffb9cd712d06b96

v4/java/android/support/v4/app/ActionBarDrawerToggle.java

@@ -247,6 +247,7 @@ public boolean onOptionsItemSelected(MenuItem item) {
             } else {
                 mDrawerLayout.openDrawer(GravityCompat.START);
             }
+            return true;
         }
         return false;
     }