Fix return values of CanZASPass

- CanZASPass is supposed to return boolean.  Nobody noticed this bug because ATMOS_PASS_YES and ATMOS_PASS_NO happen to be defined as 1 and 0.  But thats not a good assumption to make, so lets fix it!

code/modules/mob/living/living_movement.dm

@@ -8,8 +8,9 @@
 		return !P.can_hit_target(src, P.permutated, src == P.original, TRUE)
 	return (!mover.density || !density || lying)
 
-/mob/CanZASPass(turf/T, is_zone)
-	return ATMOS_PASS_YES
+// There is no need to override this if you're just going to unconditionally return TRUE.  Set can_atmos_pass instead.
+///mob/CanZASPass(turf/T, is_zone)
+//	return TRUE
 
 /mob/living/SelfMove(turf/n, direct)
 	// If on walk intent, don't willingly step into hazardous tiles.

code/modules/power/turbine.dm

@@ -96,7 +96,7 @@
 
 // When anchored, don't let air past us.
 /obj/machinery/compressor/CanZASPass(turf/T, is_zone)
-	return anchored ? ATMOS_PASS_NO : ATMOS_PASS_YES
+	return !anchored
 
 /obj/machinery/compressor/proc/locate_machinery()
 	if(turbine)