Fix getting the starting room from RoomManager

[heyitsmdr]

When a player is hydrated, if the player isn't in a valid room, a call to state.RoomManager.getStartingRoom() is made, which is undefined.

[shawncplus]

The fix here is to just fix the place that calls getStartingRoom() to use .startingRoom like https://github.com/shawncplus/ranviermud/blob/staging/bundles/ranvier-input-events/input-events/finish-player.js#L21

[heyitsmdr]

Cool, I'll update that.