[MDB Ignore] Removes circuit board recipe for vend a tray (#93517)

## About The Pull Request
- Closes #93497

'Vend a trays' are not subtypes of machines but structures i.e. their
path is `/obj/structure/displaycase/forsale`. You can't create
structures with machine circuit boards so they runtime like hell

You can still create an Vend a tray by
- Creating a "display case chassis" with 5 wood
- Inserting a card reader in it

It's just this broken way of designing the tray has to go

## Changelog
🆑
del: Removes circuit board recipe for vend a tray. Use 5 wood to create
a "display case chassis" and insert a card reader to create the tray
instead
/🆑

code/modules/research/techweb/nodes/engi_nodes.dm

@@ -218,7 +218,6 @@
 		"holobarrier_jani",
 		"holobarrier_med",
 		"holopad",
-		"vendatray",
 		"holodisk",
 		"modular_shield_gate",
 		"modular_shield_generator",