Observer Orbit menu is now fancy TGUI (#14810)

* Observer menu is now fancy TGUI

* Review comments.

* Actually, let's show more of the antags in the selection.

code/modules/admin/verbs/randomverbs.dm

@@ -281,7 +281,7 @@
 			if(!g.client.holder)						//Remove the verb from non-admin ghosts
 				g.verbs -= /mob/dead/observer/verb/toggle_antagHUD
 			if(g.antagHUD)
-				g.antagHUD = 0						// Disable it on those that have it enabled
+				g.antagHUD = FALSE						// Disable it on those that have it enabled
 				g.has_enabled_antagHUD = 2				// We'll allow them to respawn
 				to_chat(g, "<span class='danger'>The Administrator has disabled AntagHUD </span>")
 		config.antag_hud_allowed = 0
@@ -320,7 +320,7 @@
 		for(var/mob/dead/observer/g in get_ghosts())
 			to_chat(g, "<span class='danger'>The administrator has placed restrictions on joining the round if you use AntagHUD</span>")
 			to_chat(g, "<span class='danger'>Your AntagHUD has been disabled, you may choose to re-enabled it but will be under restrictions </span>")
-			g.antagHUD = 0
+			g.antagHUD = FALSE
 			g.has_enabled_antagHUD = 0
 		action = "placed restrictions"
 		config.antag_hud_restricted = 1