Remove UID from all users

We don't need preconfigure it. This way it won't change the UID of
existing accounts, having to recreate them in the process.

data_bags/users/galfert.json

@@ -4,6 +4,5 @@
     "ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEAzxZ8uVOc30yK1wZAs/qicumvN1p8xswyxQcBE3qgQdzP63w0i+osk12THuYSY8mymAUFiTVRaxLet6CbRDBql0S6mYKwWZZZmGJ27xpIxBuzzsx4E527CRn5N68MbDRU37sp5ZrZ/RhSaoaOp8yOWEXs+vFKZbOp2CsKZFRiTV8VB9KOqgvgV2Zk2ocTb+vziNyag4DQtkipxJ/5G+fOTpcRjzFYvWKz0IGjKOmboGnshjbC1A46s/EFCJ1QQ5HqeI8R2tbGpR2YV1k9wJXWxzxcvF1xNSAwXxjTJ4nIC/G2yYkZO/jHXjsBeC5oBwqd15haR2/aM3jXeG9YurURnw== gba@FUCKUP"
   ],
   "groups": ["sysadmin", "systemd-journal"],
-  "uid": 2004,
   "shell": "\/bin\/bash"
 }