Slightly up titles per template update from 8 to 10

At 8 titles per job dequeue rate was roughly in equilibrium, but not enough to
keep the queue smallish. The load on the API throughout the week was low
though (and the outage last weekend was not really caused by Parsoid), so
increasing it slightly to 10 is safe to do.

Change-Id: I45860e0dbf63a709b1e4244d403cd5c2c25deab2