iwlwifi: mvm: fix OOC priority in scans
The code that sets the correct out-of-channel priority depending on
the scan type was accidentally removed during a rebase. Add it back.
Fixes: c1a7515393e4 ("iwlwifi: mvm: add adaptive dwell support")
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>