setKey(): call the higher level wrapper setModifiedKey() instead of...

setKey(): call the higher level wrapper setModifiedKey() instead of touchWatchedKey() even if currently they are exactly the same.

src/db.c

@@ -110,7 +110,7 @@ void setKey(redisDb *db, robj *key, robj *val) {
     }
     incrRefCount(val);
     removeExpire(db,key);
-    touchWatchedKey(db,key);
+    signalModifiedKey(db,key);
 }
 
 int dbExists(redisDb *db, robj *key) {