daemon: Reevaluate polling timeout after resume
When polling is resumed the timeout needs to be reevaluated. This requires running the polling handler once (in the next mainloop iteration).
Set the ready time to zero to ensure this is happening. Without this, we would be stuck without actually polling until we get a uevent from the kernel on one of the power supplies.
Fixes: #198 (closed)
NOTE: This needs to be backported into a to-be-defined branch (pre battery split refactoring)