Unified CMO blues slightly, updates garment bags slightly, updates CMO locker contents slightly (#93321)

## About The Pull Request

### CMO palette update

Before - after

<img width="533" height="324" alt="image"
src="https://github.com/user-attachments/assets/c8a843a6-875d-4796-8c62-d24dd509147b"
/>

Logical follow up to #93313 and #91902

CMO now has a backpack which matches their teal palette rather than
re-using the medical doctor's blue backpack

CMO now starts with white sneakers instead of blue sneakers

### Garment bag update

Garment bags can hold backpacks, duffels, etc. 

However they CANNOT store backpacks which have ANY contents, so no risk
of storage nesting memes here.

### Misc

Removed the defib mount from the CMO's closet

Minor bugfix for being unable to swap storage positions of items which
were instantiated in a storage

## Why It's Good For The Game

- Much like the Paramedic, the CMO has had many cooks which have not
always been on the same page, so this makes their sprite a bit more
coherent.

- Heads with unique packs just tossed them in their closet which is
pretty spammy given we have four variants now. Putting them in the
garment back makes sense.

- Defib mount in CMO's locker hasn't been necessary for a while now that
all treatment centers spawn with defib mounts.

- Bugfix.

## Changelog

🆑 Melbert
image: CMO now has unique backpack/satchel/etc. sprites which matches
their teal palette.
image: CMO spawns with white sneakers instead of blue sneakers.
qol: Garment bags can hold empty backpacks/satchels/etc.
del: Defib mount removed from CMO's locker.
fix: Items stocked in a storage item by default can be
mouse-drag-swapped like any other item.
/🆑

code/modules/jobs/job_types/chief_medical_officer.dm

@@ -66,15 +66,15 @@
 		)
 	belt = /obj/item/modular_computer/pda/heads/cmo
 	ears = /obj/item/radio/headset/heads/cmo
-	shoes = /obj/item/clothing/shoes/sneakers/blue
+	shoes = /obj/item/clothing/shoes/sneakers/white
 	l_pocket = /obj/item/laser_pointer/blue
 	r_pocket = /obj/item/pinpointer/crew
 	l_hand = /obj/item/storage/medkit/surgery
 
-	backpack = /obj/item/storage/backpack/medic
-	satchel = /obj/item/storage/backpack/satchel/med
-	duffelbag = /obj/item/storage/backpack/duffelbag/med
-	messenger = /obj/item/storage/backpack/messenger/med
+	backpack = /obj/item/storage/backpack/chief_medic
+	satchel = /obj/item/storage/backpack/satchel/chief_medic
+	duffelbag = /obj/item/storage/backpack/duffelbag/chief_medic
+	messenger = /obj/item/storage/backpack/messenger/chief_medic
 
 	box = /obj/item/storage/box/survival/medical
 	chameleon_extras = list(