Cult hud on deconversion fix

Fixes the long-standing bug which meant that a client's icon over their
mob was not removed when deconverted, leading to mass confusion.

code/modules/reagents/Chemistry-Reagents.dm

@@ -646,6 +646,7 @@ datum
 					if((M.mind in ticker.mode.cult) && prob(10))
 						M << "\blue A cooling sensation from inside you brings you an untold calmness."
 						ticker.mode.remove_cultist(M.mind)
+						ticker.mode.remove_all_cult_icons_from_client(M.client)  // fixes the deconverted's own client not removing their mob's cult icon
 						for(var/mob/O in viewers(M, null))
 							O.show_message(text("\blue []'s eyes blink and become clearer.", M), 1) // So observers know it worked.
 					// Vamps react to this like acid