Messaging: Use a DayNight launch theme

This prevents the white launch screen from appearing when the system theme
is dark

Change-Id: I861f9e5a58b4bb52385c75459fc4de73532d15a8

src/com/android/messaging/ui/conversationlist/ConversationListActivity.java

@@ -31,6 +31,7 @@ public class ConversationListActivity extends AbstractConversationListActivity {
     @Override
     protected void onCreate(final Bundle savedInstanceState) {
         Trace.beginSection("ConversationListActivity.onCreate");
+        setTheme(R.style.BugleTheme_ConversationListActivity);
         super.onCreate(savedInstanceState);
         setContentView(R.layout.conversation_list_activity);
         Trace.endSection();