Teardown path auto-detection doesn't verify version compatibility

[gnalvesteffer]

There is a report that a user had where they started up 0.3.1 on a clean install and it detected their Teardown path, but the version check indicator was yellow and they couldn't press Play and had to manually select their teardown.exe for it to verify as a workaround.

[metype]

The only way this one could happen, looking at how this state could arise, it that for whatever given reason the Teardown install folder does exist. But the teardown.exe inside does not exist. I think I'll change the detection for the game to prevent this case further and make the failure state more consistent, only populating if it knows the files exists.