Fix hours-from-now helper test failing sometimes
Fix hours-from-now helper test failing sometimes

Fix the test failing on slow machines by scheduling an afterRender
callback to the run loop.

streamlink/streamlink-twitch-gui,bastimeyer/livestreamer-twitch-gui,streamlink/streamlink-twitch-gui,chhe/livestreamer-twitch-gui,chhe/livestreamer-twitch-gui,bastimeyer/livestreamer-twitch-gui,bastimeyer/livestreamer-twitch-gui,chhe/livestreamer-twitch-gui,streamlink/streamlink-twitch-gui