iwlwifi: mvm: cancel the scan delayed work when scan is aborted

When we abort the scan because of a firmware crash, we
need to cancel the delayed work that monitors the scan
completion. Otherwise it'll kick and try to restart the
firmware yet another time.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Link: https://lore.kernel.org/r/iwlwifi.20210205110447.a497faa942dd.Ibc155ad36da9de7eb0ddcdd826ddf8dd6607d2ac@changeid
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>