[L2Server] Z coordinate is ignored for areas

[Master Toma]

Original bug. Check this video from original C1 server

https://www.youtube.com/watch?v=6MCvVOK7jJE&feature=youtu.be

Char is inside X-Y of mother tree area, so I got system message but regen dosn't work here, because regen checks Z as well
but system message doesn't check Z, only X-Y

It affects all areas (Z is not checked)