router_readconfig: don't prefix error messages with timestamps
router_readconfig: don't prefix error messages with timestamps

Parse errors will be almost instant, and the relay will terminate, so no
need to add useless information here.

piotr1212/carbon-c-relay,piotr1212/carbon-c-relay,grobian/carbon-c-relay,grobian/carbon-c-relay,grobian/carbon-c-relay,piotr1212/carbon-c-relay,piotr1212/carbon-c-relay