deck: unnecessary oauth-url arg

[mirandachrist]

What happened: The oauth-url arg to Deck is described as the "path to deck user dashboard endpoint." We only check if it has been specified to decide whether to enable oauth, and do nothing with the path, since /github-login is hardcoded as the actual oauth URL.

What you expected to happen: There's no reason the user needs to specify the oauth URL, so this can be changed to a boolean, which will still allow us to check whether oauth has been set up.

[stevekuznetsov]

/area prow/deck

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[Rustin170506]

/reopen

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