PLUGIN-1520 fix uri builder usage

Before it would work in unit test but not in actual instances
due to a different URI builder implementation.

src/main/java/io/cdap/plugin/batch/source/ftp/FTPBatchSource.java

@@ -262,7 +262,7 @@ public String getPath() {
         if (port == -1 && protocol.equals(SFTP_PROTOCOL)) {
           port = DEFAULT_SFTP_PORT;
         }
-        return UriBuilder.fromUri(urlInfo.toUri()).port(port).userInfo(null).toString();
+        return UriBuilder.fromUri(urlInfo.toUri()).port(port).userInfo(null).build().toString();
       }
       return path;
     }