dialogs: remove border around toolbar icons in preferences

Author: haaninjo

app/dialogs/preferences-dialog.c

@@ -2308,7 +2308,7 @@ prefs_dialog_new (Gimp       *gimp,
   vbox2 = prefs_frame_new (_("Tools Configuration"),
                            GTK_CONTAINER (vbox), TRUE);
   tool_editor = gimp_tool_editor_new (gimp->tool_item_list, gimp->user_context,
-                                      GIMP_VIEW_SIZE_SMALL, 1);
+                                      GIMP_VIEW_SIZE_SMALL, 0);
 
   gtk_box_pack_start (GTK_BOX (vbox2), tool_editor, TRUE, TRUE, 0);
   gtk_widget_show (tool_editor);