Drive doesn't display properly

[Gerold55]

The drive doesn't display properly

• Minetest version: 5.3.0
• Other mods activated: melterns, fluid_api, generators (a mod that only adds nodes)

[theFox6]

The drive has only one texture so far, it does not yet display how many slots are occupied

[beepbopbeepboop]

I've fixed the gross inbalance in the GUI, see my pull request. The blinking lights should likely be done with entities, the drawer mod uses them to paint on top the draw and it seems to work well.