Proper mirror PR for the disease refactor because I fucked up the first one. (#2026)

* Revert "im a dumbass and didn't see the .rej files Revert "[MIRROR] Disease Refactor" (#2025)"

This reverts commit 44742cb115.

* Delete shuttle_loan.dm.rej

* Delete life.dm.rej

* Update life.dm

* Delete life.dm.rej

* compile

code/_onclick/other_mobs.dm

@@ -100,7 +100,8 @@
 							"<span class='userdanger'>[name] bites [ML]!</span>")
 			if(armor >= 2)
 				return
-			for(var/datum/disease/D in viruses)
+			for(var/thing in viruses)
+				var/datum/disease/D = thing
 				ML.ForceContractDisease(D)
 		else
 			ML.visible_message("<span class='danger'>[src] has attempted to bite [ML]!</span>")