Harrier now has anesthesia tank. (#4075)

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## About The Pull Request
Harrier now has anesthesia tank, yippie.
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documented or this can delay review and even discourage maintainers from
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## Why It's Good For The Game
Open brain surgery because no aneth is No Good
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## Changelog

:cl:
add: Nanotrasen no longer expects you to preform open heart surgery with
no anesthesia of any kind on the Harrier. Rejoice.
/:cl:

_maps/shuttles/nanotrasen/nanotrasen_harrier.dmm

@@ -2306,6 +2306,8 @@
 /obj/item/clothing/suit/nanotrasen/medical_smock,
 /obj/item/clothing/head/nanotrasen/surgical,
 /obj/machinery/firealarm/directional/east,
+/obj/item/tank/internals/anesthetic,
+/obj/item/clothing/mask/breath/medical,
 /turf/open/floor/plasteel/showroomfloor,
 /area/ship/medical)
 "mH" = (