Anchors the yautja carpnade (#4074)

# About the pull request
Anchors the carpnade found in the yautja ship.

# Explain why it's good for the game

- Requested by forest
- Prevents people abducted onto the pred ship from being dumb with the
grenade
- Prevents preds from unwittingly handing out the carpnade despite it
being expressly prohibited by a senator (see
[here](https://discord.com/channels/150315577943130112/207230793423126539/966035290399592468))

# Testing Photographs and Procedure
<details>
<summary>Screenshots & Videos</summary>

It's a one tile change

</details>


# Changelog
:cl:
del: You can no longer move the carp nade in the yautja ship
/:cl:

---------

Co-authored-by: John Doe <[email protected]>

maps/predship/huntership.dmm

@@ -2623,7 +2623,10 @@
 /obj/structure/surface/table/reinforced/prison{
 	color = "#6b675e"
 	},
-/obj/item/explosive/grenade/spawnergrenade/spesscarp,
+/obj/item/explosive/grenade/spawnergrenade/spesscarp{
+	anchored = 1;
+	desc = "A strange device taken from a far-off land. It looks incredibly fragile, best not to touch it."
+	},
 /turf/open/floor/corsat{
 	dir = 1;
 	icon_state = "squareswood"