removes facehugger plasma (#6558)

# About the pull request

Facehuggers have no plasma, their abilities don't use plasma, they don't
have any reason to have plasma, just HUD clutter.
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# Explain why it's good for the game
# Testing Photographs and Procedure
<details>
<summary>Screenshots & Videos</summary>

Put screenshots and videos here with an empty line between the
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# Changelog
:cl:
qol: Facehuggers no longer show as having any plasma

/:cl:

code/modules/mob/living/carbon/xenomorph/castes/Facehugger.dm

@@ -1,8 +1,8 @@
 /datum/caste_datum/facehugger
 	caste_type = XENO_CASTE_FACEHUGGER
 	tier = 0
-	plasma_gain = 0.1
-	plasma_max = 10
+	plasma_gain = XENO_PLASMA_GAIN_TIER_1
+	plasma_max = XENO_NO_PLASMA
 	melee_damage_lower = 5
 	melee_damage_upper = 5
 	max_health = XENO_HEALTH_LARVA