fix: doDeleteFiles deletes files (#5198)

weed/command/filer_sync.go

@@ -410,7 +410,7 @@ func genProcessFunction(sourcePath string, targetPath string, excludePaths []str
 		}
 		// handle deletions
 		if filer_pb.IsDelete(resp) {
-			if doDeleteFiles {
+			if !doDeleteFiles {
 				return nil
 			}
 			if !strings.HasPrefix(string(sourceOldKey), sourcePath) {