Fix bug #14392376 ActionBar icon / title is focusable when it doesn't do anything

- set ActionBar.setHomeButtonEnabled(boolean) as it should be

Change-Id: I93adcdf91cafd5b7a6fea88ec917f12a39be64bc

src/com/android/settings/SettingsActivity.java

@@ -500,8 +500,8 @@ public class SettingsActivity extends Activity
         }
 
         mActionBar = getActionBar();
-        mActionBar.setHomeButtonEnabled(true);
         mActionBar.setDisplayHomeAsUpEnabled(mDisplayHomeAsUpEnabled);
+        mActionBar.setHomeButtonEnabled(mDisplayHomeAsUpEnabled);
 
         // see if we should show Back/Next buttons
         Intent intent = getIntent();