Fixes PMC Survivor Synth AGAIN (#3938)

# About the pull request
Again removes marine comms from PMC survivor synth. Please stop sneaking
marine comms into survivors.
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# Explain why it's good for the game
-_-
# Testing Photographs and Procedure
<details>
<summary>Screenshots & Videos</summary>

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</details>


# Changelog
:cl:
fix: Fixes PMC survivor synth spawning with marine comms, again.
/:cl:

code/game/objects/effects/landmarks/survivor_spawner.dm

@@ -80,7 +80,7 @@
 
 /obj/effect/landmark/survivor_spawner/bigred_crashed_pmc_medic
 	equipment = /datum/equipment_preset/survivor/pmc/medic
-	synth_equipment = /datum/equipment_preset/pmc/synth
+	synth_equipment = /datum/equipment_preset/synth/survivor/pmc
 	intro_text = list("<h2>You are a survivor of a crash landing!</h2>",\
 	"You are NOT aware of the xenomorph threat.",\
 	"Your primary objective is to heal up and survive. If you want to assault the hive - adminhelp.")
@@ -93,7 +93,7 @@
 
 /obj/effect/landmark/survivor_spawner/bigred_crashed_pmc_engineer
 	equipment = /datum/equipment_preset/survivor/pmc/engineer
-	synth_equipment = /datum/equipment_preset/pmc/synth
+	synth_equipment = /datum/equipment_preset/synth/survivor/pmc
 	intro_text = list("<h2>You are a survivor of a crash landing!</h2>",\
 	"You are NOT aware of the xenomorph threat.",\
 	"Your primary objective is to heal up and survive. If you want to assault the hive - adminhelp.")