Only show reminder notifications when notifications are enabled

tests/unittests/ui/stub_ui.c

@@ -486,6 +486,10 @@ ProfWin* win_create_private(const char * const fulljid)
 
 void win_update_virtual(ProfWin *window) {}
 void win_free(ProfWin *window) {}
+gboolean win_notify(ProfWin *window)
+{
+    return TRUE;
+}
 int win_unread(ProfWin *window)
 {
     return 0;