wait for EmojiCompat to be initialized before using it (#791)

app/src/main/java/com/keylesspalace/tusky/MainActivity.java

@@ -387,8 +387,13 @@ public final class MainActivity extends BottomSheetActivity implements ActionBut
             drawer.addItem(debugItem);
         }
 
+        EmojiCompat.get().registerInitCallback(new EmojiCompat.InitCallback() {
+            @Override
+            public void onInitialized() {
                 updateProfiles();
             }
+        });
+    }
 
     private boolean handleProfileClick(IProfile profile, boolean current) {
         AccountEntity activeAccount = accountManager.getActiveAccount();