Minor QoL improvement to HC launcher

[srmalloy]

If you leave the launcher up so you can just click to start the client, you will not see that there has been an update until you are told that there is a client mismatch when you try to log in, and you won't see the 'unable to determine update status' message until you exit the client. Checking for updates manually only takes a moment, but it requires that you select the option from the drop-down menu. Would it be possible to either make the launcher automatically check for updates when you click to start the client, or make it an option to do so for the people who can't wait the extra couple of seconds for the check?