At the moment, when an IdleDetector is inhibited, it can emit the
resumed signal. It makes sense on one hand, but also it doesn't.
Inhibited != resumed.

According to the idle-inhibit-v1 protocol specification, we don't
need to emit the resumed signal:

> Likewise, the inhibitor isn't honored if the system was already idled at
> the time the inhibitor was established, although if the system later
> de-idles and re-idles the inhibitor will take effect.