gtk.cfg: Remove incorrect release function

gtk_widget_destroy is only for GtkWidget derived objects.

Author: Tamaranch

cfg/gtk.cfg

@@ -910,7 +910,6 @@
     <alloc init="true" no-fail="true">g_zlib_decompressor_new</alloc>
     <use>g_object_ref</use>
     <dealloc>g_object_unref</dealloc>
-    <dealloc>gtk_widget_destroy</dealloc>
   </memory>
   <memory>
     <alloc init="true" no-fail="true">g_tree_new</alloc>