Don't set facing on initial position update

[tsdko]

Prevents clients from having their facing set to east in case they don't send an f packet after connecting. The cause was the x > c.x condition always being hit (any valid X coordinate > -1). Prior to 651597c the extra condition wasn't strictly necessary because north-facing (default, no f sent) clients would've hit c.y < y (-1 < any valid Y coordinate) and have their facing set to north again.

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Reproduction steps:

1. connect with player 1
2. connect with player 2
3. ensure they're both in the same room
4. make player 1 face north
5. reconnect with player 1 (to reset position to (-1, -1))
6. reconnect with player 2 (to get server facing instead of client facing)

Facing of player 1 as seen by player 2 after doing all of the above:

Current master	east
This patch	south (due to the bug described in ynoproject/ynoengine#67; north on the server)