Granularizes defib crate at the outpost (#3040)

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## About The Pull Request

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Defib crates now contain a single defib, and desc and price changed
accordingly.

## Why It's Good For The Game

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worth adding. -->

Fine control over your orders are good, and you can always buy that
second defib anyways if you really need it.

## Changelog

:cl:
tweak: Defib crate now contains a single defib, priced 750
/:cl:

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code/modules/cargo/packs/medical.dm

@@ -61,10 +61,9 @@
 
 /datum/supply_pack/medical/defibs
 	name = "Defibrillator Crate"
-	desc = "Contains two defibrillators for bringing the recently deceased back to life."
-	cost = 1500
-	contains = list(/obj/item/defibrillator/loaded,
-					/obj/item/defibrillator/loaded)
+	desc = "Contains a defibrillator for bringing the recently deceased back to life."
+	cost = 750
+	contains = list(/obj/item/defibrillator/loaded)
 	crate_name = "defibrillator crate"
 
 /datum/supply_pack/medical/surgery