wifi: iwlwifi: mvm: always send nullfunc frames on MGMT queue

Non-QOS nullfunc frames should be sent on MGMT queue similarly to
the QOS nullfunc frames. It means that the corresponding TID should
remain IWL_MAX_TID_COUNT. Make the condition more strict, so the TID
won't be changed to IWL_TID_NON_QOS.

Link: https://lore.kernel.org/r/20230127002430.a05bf77c9e29.I06262424878232b46fecd58743c889e4c3216bbf@changeid
Signed-off-by: Gregory Greenman <gregory.greenman@intel.com>