Changes how clumsy checks are handled (#6299)

This pr adds the is_clumsy check, that checks if the mob has the mutation or if they are drunk enough. This fixes a bug where mobs would still have the clumsy mutation due to drinking.

code/modules/paperwork/paper.dm

@@ -111,7 +111,7 @@
 	set category = "Object"
 	set src in usr
 
-	if((CLUMSY in usr.mutations) && prob(50))
+	if((usr.is_clumsy()) && prob(50))
 		to_chat(usr, span("warning", "You cut yourself on the paper."))
 		return
 	var/n_name = sanitizeSafe(input(usr, "What would you like to label the paper?", "Paper Labelling", null)  as text, MAX_NAME_LEN)