Fix bot behavior while frozen.

Bots normally would stop aiming (or well, looking for targets) and firing after getting frozen (CF_FROZEN), even if the flag doesn't stop said inputs. Conversely, bots would keep aiming if they had a target before getting totally frozen, which isn't correct, as the CF_TOTALLYFROZEN flag does prevent looking around.

This changes that behavior to be more accurate to what the flags actually do.