Implement suggested fix from #1013

[lol768]

Fixes auth-loop on Linux/Gnome systems.

Thanks @ksullivan

See also https://github.com/GNOME/gnome-keyring/blob/f24e374/daemon/dbus/gkd-secret-util.c#L111 for root-cause

Reviewers

r? @ cc @stripe/developer-products

Summary

• Previously, users on Linux/Gnome were stuck in an auth loop and unable to use the Stripe CLI at all for anything live mode related. This is because of a bug in the upstream 99designs keyring module (which I think https://github.com/99designs/keyring/pull/90 would've fixed if it was pulled). We work around Gnome's encoding logic and 99designs' handling logic by using a simpler keychain name, without spaces.
• If pulled, this is likely to require some users who already have credentials in the previously-named keychain to need to re-authenticate.

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