MDEV-24997 Assertion mtr->is_named_space(page_id.space()) in ibuf0ibuf.cc:624

- This is caused by commit deadec4e
(MDEV-24569). InnoDB fails to set the tablespace associated with
mini-transacton while resetting the change buffer bitmap bits of
the page.

storage/innobase/ibuf/ibuf0ibuf.cc

@@ -4251,6 +4251,7 @@ void ibuf_merge_or_delete_for_page(buf_block_t *block, const page_id_t page_id,
 		if (bitmap_bits && fseg_page_is_free(
 				space, page_id.page_no())) {
 			ibuf_mtr_start(&mtr);
+			mtr.set_named_space(space);
 			ibuf_reset_bitmap(block, page_id, zip_size, &mtr);
 			ibuf_mtr_commit(&mtr);
 			bitmap_bits = 0;