[TF2] Fix disguise_on_backstab not functioning for stab targets that become ghosts #1279
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Description
Fixes ValveSoftware/Source-1-Games#4477
Players with cond TF_COND_HALLOWEEN_IN_HELL do not change m_lifeState when they are killed, instead gaining TF_COND_HALLOWEEN_GHOST_MODE; the IsAlive() check used in successful backstab checks solely looks at lifestate, so backstabs on these players are never considered successful despite causing their 'death'. This fixes the check to account for GHOST_MODE.
Tested that the player properly obtains GHOST_MODE in time for the check when stabbed with IN_HELL.