Fix Github status plugin for flakes

If the root flake is a github: one, github status notifications are sent to it. The githubstatus->inputs configuration isn't used for flakes.

Created by  Silvan Mosberger  on February 5, 2021
6XZA5RB6BSKGDOK7DM4BFIMVZ46NY6IETDORSRISGZAVR2ZEK4PAC
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