[gimp] app: use gimp-layer as visibility lock icon.

[Jehan <jehanp src gnome org>]

commit 0a5a20cbb8603b583a7a09162b2e0a670c716ee7
Author: Jehan <jehan girinstud io>
Date:   Tue Feb 9 12:29:17 2021 +0100

    app: use gimp-layer as visibility lock icon.
    
    The 2 eyes next to each other are just weird in this layout.

 app/widgets/gimpdrawabletreeview.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/app/widgets/gimpdrawabletreeview.c b/app/widgets/gimpdrawabletreeview.c
index ad3ae0b7d9..6e6d10b45d 100644
--- a/app/widgets/gimpdrawabletreeview.c
+++ b/app/widgets/gimpdrawabletreeview.c
@@ -122,7 +122,7 @@ gimp_drawable_tree_view_class_init (GimpDrawableTreeViewClass *klass)
   item_view_class->lock_content_tooltip      = _("Lock pixels");
   item_view_class->lock_position_icon_name   = GIMP_ICON_TOOL_MOVE;
   item_view_class->lock_position_tooltip     = _("Lock position and size");
-  item_view_class->lock_visibility_icon_name = GIMP_ICON_VISIBLE;
+  item_view_class->lock_visibility_icon_name = GIMP_ICON_LAYER;
   item_view_class->lock_visibility_tooltip   = _("Lock visibility");
 }