Remove potentially-harmful condition in message_mission_free_avi()

If we tell it to free up the animation, I think it should happen regardless of whether or not the HUD_TALKING_HEAD gauge is currently active or not. Also, unloading an animation shouldn't crash even if one wasn't loaded in the first place... and if it does, we should probably fix that instead of slapping a band-aid on the calling function.

Author: MageKing17

code/mission/missionmessage.cpp

@@ -748,11 +748,6 @@ void message_mission_free_avi(int m_index)
 	if ( (m_index < 0) || (m_index >= Num_message_avis) )
 		return;
 
-	// Make sure this code doesn't get run if the talking head guage is off
-	// helps prevent a crash on jump out if this code doesn't work right
-	if ( !hud_gauge_active(HUD_TALKING_HEAD) )
-		return;
-
 	generic_anim_unload(&Message_avis[m_index].anim_data);
 }