Fixes synths being unlungeable while in "critical state" (#5303)

# About the pull request

Synths were given immunity to dragging from old code back when they
could go into 'crit' so they dont get dragged to hell, however they no
longer have a crit state but still keep the immunity lunges also do not
work because of this. this is not intended.

# Explain why it's good for the game

bugfix


# Testing Photographs and Procedure
<details>
<summary>Screenshots & Videos</summary>
yeah i tested it also no you cant get dragged while dead

</details>


# Changelog
:cl:
fix: Synths are no longer immune to lunges / dragging while in 'critical
state' since they dont go into crit.
/:cl:

Co-authored-by: InsaneRed <[email protected]>

code/modules/mob/living/carbon/xenomorph/Xenomorph.dm

@@ -731,8 +731,6 @@
 	if(!isliving(AM))
 		return FALSE
 	var/mob/living/L = AM
-	if(issynth(L) && L.health < 0) // no pulling critted or dead synths
-		return FALSE
 	if(L.buckled)
 		return FALSE //to stop xeno from pulling marines on roller beds.
 	if(!L.is_xeno_grabbable())