re-enable idle scripts

[hb020]

See https://github.com/HASwitchPlate/openHASP/issues/618

The idle scripts were inoperative since a recent commit.

Not sure if what I claim is true, but this is my interpretation: Since:

• dispatch_idle_state() seems to be called also when a state situation is requested (dispatch_current_state())
• dispatch_idle() seems to be called only upon startup
• hasp_set_sleep_state() seems to be deprecated

and we want the scripts to be called only when the state changes, I decided to put the scripts directly in the function that detects the changes: hasp_update_sleep_state()

[hb020]

Done

[fvanroie]

Thanks!