netfilter: nf_tables: do not compare internal table flags on updates

[ Upstream commit 4a0e7f2d ]

Restore skipping transaction if table update does not modify flags.

Fixes: 179d9ba5 ("netfilter: nf_tables: fix table flag updates")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>