[owner hud] do a distance check when leashing (all)

[lickx]

When Dom is on the ground, and sub on a skyplatform, and D leashes, sub falls through the platform towards the Dom.

Maybe do a distance check, and then either don't leash if too far away, or teleport to Dom

[lickx]

This is now implemented. Let me know if 20 meter (say distance) is too short.