Fix trailing slash handling in WebSocket URL pathname #1440
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resolve #1439
Previously, the code attempted to remove the trailing slash from urlObj.pathname by setting it to an empty string and then appending "/rtc". However, since URL objects always return "/" for an empty path when a host is present, the existing approach never truly removed the slash. This PR updates the logic to explicitly check if the pathname ends with a slash. If it does, we simply append "rtc". Otherwise, we append "/rtc". This ensures the final path is correctly formed without relying on the pathname being set to an empty string.
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