intel: Remove renderbuffer delete setup from texture wrapping.

This is already set by intel_new_renderbuffer().

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

src/mesa/drivers/dri/intel/intel_fbo.c

@@ -489,7 +489,6 @@ intel_renderbuffer_update_wrapper(struct intel_context *intel,
    struct intel_mipmap_tree *mt = intel_image->mt;
    int level = image->Level;
 
-   rb->Delete = intel_delete_renderbuffer;
    rb->AllocStorage = intel_nop_alloc_storage;
 
    intel_miptree_check_level_layer(mt, level, layer);