[MERGED PR] Removes the security alert HUD button

[Kateaclysm]

I've also played a bunch of rounds since this was test merged and I haven't noticed a difference, but I really do like the idea of giving the pager to assistants. Preying on security assistants is particularly dastardly (how DARE you) and should carry an associated risk rather than what equates to an "easier" security officer takedown.