Waypoints from dispatch not compatible with ps-dispatch v2 calls

[mikepauer]

Looks like in ps-dispatch v2 the alert coords are located in coords.xyz while dispatch v1 had them in origin.xyz.

mdt:client:setWaypoint in client.lua needs to be adapted to handle this.

[MonkeyWhisper]

https://github.com/Project-Sloth/ps-mdt/pull/398