Merges the Janicart Floor Buffer into the Janiborg Floor Buffer (#25125)

* One Floor Buffer For All!

* better name

* Update code/modules/research/designs/mechfabricator_designs.dm

Co-authored-by: DGamerL <108773801+DGamerL@users.noreply.github.com>

---------

Co-authored-by: DGamerL <108773801+DGamerL@users.noreply.github.com>

code/modules/vehicle/janivehicle.dm

@@ -43,13 +43,6 @@
 	desc = "A keyring with a small steel key, and a pink fob reading \"Pussy Wagon\"."
 	icon_state = "keyjanitor"
 
-/obj/item/janiupgrade
-	name = "floor buffer upgrade"
-	desc = "An upgrade for mobile janicarts."
-	icon = 'icons/obj/vehicles.dmi'
-	icon_state = "upgrade"
-	origin_tech = "materials=3;engineering=4"
-
 /datum/action/floor_buffer
 	name = "Toggle Floor Buffer"
 	desc = "Movement speed is decreased while active."
@@ -111,7 +104,7 @@
 		mybag = I
 		update_icon(UPDATE_OVERLAYS)
 		return
-	if(istype(I, /obj/item/janiupgrade))
+	if(istype(I, /obj/item/borg/upgrade/floorbuffer))
 		if(buffer_installed)
 			to_chat(user, fail_msg)
 			return