Fix the nested preferences title. Again.

Made a mistake when refactoring just before checkin. ! ?

core/java/android/preference/PreferenceScreen.java

@@ -150,7 +150,7 @@ public final class PreferenceScreen extends PreferenceGroup implements AdapterVi
 
         // Set the title bar if title is available, else no title bar
         final CharSequence title = getTitle();
-        Dialog dialog = mDialog = new Dialog(context, !TextUtils.isEmpty(title)
+        Dialog dialog = mDialog = new Dialog(context, TextUtils.isEmpty(title)
                 ? com.android.internal.R.style.Theme_NoTitleBar
                 : com.android.internal.R.style.Theme);
         dialog.setContentView(listView);