Select the stable update channel by default

[anewuser]

The portable 0.10.0 version has the Development update channel checked by default. Wouldn't it be better to set it to Stable?

[TKS4]

Seems also bugged, can't select stable, at all, and while it's in development, it always prompts for a download of the latest version even though you already have it installed.

[endrift]

I'll need to spin a new build with the branch set as heads/0.10.0 to get this working as-is in 0.10.0, but the code change is better going forwards as either that or 0.10.0 would work with this code change.

Looks like I can't respin the build as such. I guess I'm gonna have to live with it being broken in 0.10.0 for defaulting to stable.