WarpZoneLib_BoxTouchesBrush() fixes

Fix visual glitch when traversing warpzones with sv_areagrid_link_SOLID_NOT 0

At a specific position the black texture with green lines was visible.

Work around trigger_hurt not being detected by tracebox on geit3ctf1

This map (and the actf30 version) has some strange issue with certain brushes not being detected by tracebox because their collision flags are abnormal, this is probably not the best way to fix it but it should have no side effects and mostly fixes gameplay (there's still a rock you can walk through) until a better fix can be found.

WarpZoneLib_BoxTouchesBrush: deglobalise, add TODO

This function can be optimised when stable clients have DP_QC_FINDBOX

WarpZoneLib_BoxTouchesBrush: fix whitespace