Allow more time for setUpdatesEnabled ipc roundtrip

With severe enough cpu/dbus congestion we might end up in a situation
where lipstick gets setUpdatesEnabled(true) dbus method call, but the
reply message does not get back to mce in time and thus gets discarded.

In the worst cases the following re-tries might get timeout too, which
means that getting mce and lipstick back to sync can take much longer
than it needs to.

Using severely pessimistic timeout value does no harm, but makes it
less likely that valid replies are discarded -> use 2 minutes for now.