shell-app: Fix a memory leak in the running state

We need to free two strings that we allocated here.

https://bugzilla.gnome.org/show_bug.cgi?id=682710

src/shell-app.c

@@ -1281,6 +1281,8 @@ unref_running_state (ShellAppRunningState *state)
 
   g_clear_object (&state->remote_menu);
   g_clear_object (&state->muxer);
+  g_clear_pointer (&state->unique_bus_name, g_free);
+  g_clear_pointer (&state->remote_menu, g_free);
 
   g_slice_free (ShellAppRunningState, state);
 }