renderer: Lower ChangeLog timeout
renderer: Lower ChangeLog timeout

According to DLNA, 200ms is the upper bound of announcing changes caused by
operations through a LastChange event. Since we used 200ms to aggregate
multiple events, sometimes we sent out the LastChange event too late for the
CTT. Moving it down to 150ms seems to improve CTT situation in timing fragile
CTT tests.

Tarnyko/rygel,Pelagicore/Media-Manager-Rygel-patched,GNOME/rygel,Tarnyko/rygel,GNOME/rygel,Pelagicore/Media-Manager-Rygel-patched,Pelagicore/Media-Manager-Rygel-patched,GNOME/rygel