Sync setUpdatesEnabled() state on mce/lipstick restart

When mce starts up or it detects lipstick start up, the "screen updates
allowed" is synced with lipstick.

[mce] Sync setUpdatesEnabled() state on mce/lipstick restart
Merge pull request #76 from spiiroin/ipc_on_lipstick_restart

Sync setUpdatesEnabled() state on mce/lipstick restart