selftests: drv-net: rss_ctx: add missing cleanup in queue reconfigure

Commit under Fixes adds ntuple rules but never deletes them.

Fixes: 29a4bc1f ("selftest: extend test_rss_context_queue_reconfigure for action addition")
Reviewed-by: Joe Damato <jdamato@fastly.com>
Link: https://patch.msgid.link/20250201013040.725123-4-kuba@kernel.org


Signed-off-by: Jakub Kicinski <kuba@kernel.org>