Fix defaulting to maxLimits

If the `limits` query parameter is present, we expect it to override the `limit` variable. However, the variable was mistakenly defined locally and fails to override the outer variable.

lib/routes/listobjects.go

@@ -55,7 +55,7 @@ func ListObjects(w http.ResponseWriter, r *http.Request) {
 		l     = query.Get("limit")
 	)
 	if l != "" {
-		limit, err := strconv.Atoi(l)
+		limit, err = strconv.Atoi(l)
 		if err != nil || limit < 0 {
 			panic(apierrors.InvalidOffsetOrLimit)
 		}