Fix the server URL in the systray menu

How to reproduce

• Install a fresh 10.3 server with webui and drive addons
• install drive 3.1.2 app
• create a new folder remotely and add files to it
• synchronize
• folder and files are ok remotely and locally
• erase or edit a file local
• try to open the remote server from the app
• 404 error

Bug report in attachment