posts: admin: update lat and lng after map marker moved

We don't want to do an extra step to figure out the latitude and
longitude. Just update the lat and lng once we moved the marker.

Signed-off-by: Anton Arapov <arapov@gmail.com>
posts: admin: adjust styles, geo-my-wp metabox of wp-admin

ssia. The beauty patch.

Signed-off-by: Anton Arapov <arapov@gmail.com>