gnome: rename from gnome3

Since GNOME version is now 40, it no longer makes sense to use the old attribute name.

pkgs/desktops/gnome/core/gnome-desktop/bubblewrap-paths.patch

@@ -0,0 +1,15 @@
+--- a/libgnome-desktop/gnome-desktop-thumbnail-script.c
++++ b/libgnome-desktop/gnome-desktop-thumbnail-script.c
+@@ -536,9 +536,9 @@ add_bwrap (GPtrArray   *array,
+   g_return_val_if_fail (script->s_infile != NULL, FALSE);
+ 
+   add_args (array,
+-	    "bwrap",
+-	    "--ro-bind", "/usr", "/usr",
+-	    "--ro-bind", "/etc/ld.so.cache", "/etc/ld.so.cache",
++	    "@bubblewrap_bin@",
++	    "--ro-bind", "@storeDir@", "@storeDir@",
++	    "--ro-bind", "/run/current-system", "/run/current-system",
+ 	    NULL);
+ 
+   /* These directories might be symlinks into /usr/... */