fixed compilation error

source/ubl-settings-manager.c

@@ -45,8 +45,8 @@ void on_plug_added(GtkSocket* self, actionWidgets *builder){
     gtk_widget_set_vexpand(GTK_WIDGET(builder->socketplace),1);
     gtk_widget_set_vexpand(GTK_WIDGET(self),1);
     gtk_widget_show(builder->socketplace);
-    if main_c
-    gtk_widget_hide(applist->appSettings);
+    if (main_config.WindowTheme==0)
+    gtk_widget_hide(builder->appSettings);
     // if (main_config.WindowTheme==0)
         
     // else