Improve cold start by postponing voice note service creation.

app/src/main/java/org/thoughtcrime/securesms/MainActivity.java

@@ -54,7 +54,7 @@ public class MainActivity extends PassphraseRequiredActivity implements VoiceNot
 
     setContentView(R.layout.main_activity);
 
-    mediaController = new VoiceNoteMediaController(this);
+    mediaController = new VoiceNoteMediaController(this, true);
 
     ConversationListTabRepository         repository = new ConversationListTabRepository();
     ConversationListTabsViewModel.Factory factory    = new ConversationListTabsViewModel.Factory(repository);

app/src/main/java/org/thoughtcrime/securesms/conversationlist/ConversationListFragment.java

@@ -881,7 +881,7 @@ public class ConversationListFragment extends MainFragment implements ActionMode
           AppStartup.getInstance().onCriticalRenderEventEnd();
           startupStopwatch.split("first-render");
           startupStopwatch.stop(TAG);
-
+          mediaControllerOwner.getVoiceNoteMediaController().finishPostpone();
           if (getContext() != null) {
             ConversationFragment.prepare(getContext());
           }