qingstor: fix rclone cleanup

This patch changes to using the default page limit for listing
unfinished multpart uploads rather than 1000. 1000 is the maximum
specified in the docs, but setting anything larger than 200 gives an
error.

backend/qingstor/qingstor.go

@@ -872,11 +872,12 @@ func (f *Fs) cleanUpBucket(ctx context.Context, bucket string) (err error) {
 	if err != nil {
 		return err
 	}
-	maxLimit := int(listLimitSize)
+	// maxLimit := int(listLimitSize)
 	var marker *string
 	for {
 		req := qs.ListMultipartUploadsInput{
-			Limit:     &maxLimit,
+			// The default is 200 but this errors if more than 200 is put in so leave at the default
+			// Limit:     &maxLimit,
 			KeyMarker: marker,
 		}
 		var resp *qs.ListMultipartUploadsOutput