This reverts commit 582ffcfc97.
Revert "Mod customisation header's color is now based on the state of the panel rather than the hover of the container."
This reverts commit e3457d8501.
Not entirely sure why they were failing previously, but the most likely
explanation is that by freak accident some mock requests would
previously execute immediately rather than be scheduled on the API
thread, which would change execution ordering and ensure that
`ChannelManager.CurrentChannel` would become the joined channel, rather
than remaining at the channel listing.