Fix func_door_rotating with 'Starts Open' spawnflag

[FreeSlave]

There's an error in the door angles swap which leads to the rotating door with Starts open spawnflag not moving after it was "closed". The Toggle door won't respond to the trigger and non-Toggle door won't return to the position.

This is probably dangerous to merge as some existing maps may rely on this behavior. I leave this PR just to document the bug.

[mittorn]

Maybe such things should be in some "bugcomp" mode under macro? Authors of new mods do not need to rely on specific half-life behaviour

[nekonomicon]

Maybe such things should be in some "bugcomp" mode under macro?

Yeap, will be better to place new code under macro instead of stillborn PR.