Don't require backticks

[IanButterworth]

I think I've made the mistake of forgetting backticks a number of times because @registrator doesn't require them, so I habitually don't.

It's painful because the error isn't usually noticed until the position in the queue is reached.

[IanButterworth]

Just made this mistake again.

[maleadt]

I'm sympathetic, but given how there's already differences between the PkgEval bot and the Benchmarking one (which doesn't seem to get updated anymore) I'm don't really want to further diverge the invocation syntaxes.