Prevent Pyre Fly fire from warping up nearby ledges

Adds MF_NOCLIPHEIGHT to MT_PYREFLY_FIRE so that it doesn't warp up to nearby ledges, and gives the fire MF2_LINKDRAW when spawned to prevent rendering weirdness.

Fixes https://mb.srb2.org/threads/pyre-flys-flames-appear-on-top-of-nearby-walls.27756/