Staff of Aesculapius didn't always cure sliming

- incorporated <Someone>'s 1-line fix to the precheck

doc/fixes34.1

@@ -110,6 +110,7 @@ when polymorphed, player killing a paper or straw golem via fire damage
 usually stop mimicing if you polymorph while using #monster mimic capability
 under !GOLDOBJ, gold shouldn't disappear if you try to throw it at yourself
 under !GOLDOBJ, remove temp gold from inventory during restore
+Staff of Aesculapius did not always cure sliming
 
 
 Platform- and/or Interface-Specific Fixes

src/artifact.c

@@ -1138,7 +1138,7 @@ arti_invoke(obj)
 	    long creamed = (long)u.ucreamed;
 
 	    if (Upolyd) healamt = (u.mhmax + 1 - u.mh) / 2;
-	    if (healamt || Sick || Blinded > creamed)
+	    if (healamt || Sick || Slimed || Blinded > creamed)
 		You_feel("better.");
 	    else
 		goto nothing_special;