Remove trailing colon when parsing the protocol from URL (#1778)

* Remove trailing colon when parsing the protocol from URL
* Fix bug

Author: wh201906

Diff for: arduino-ide-extension/src/common/protocol/config-service.ts

@@ -60,8 +60,10 @@ export namespace Network {
     try {
       // Patter: PROTOCOL://USER:PASS@HOSTNAME:PORT/
       const { protocol, hostname, password, username, port } = new URL(raw);
+      // protocol in URL object contains a trailing colon
+      const newProtocol = protocol.replace(/:$/, '');
       return {
-        protocol,
+        protocol: newProtocol,
         hostname,
         password,
         username,