[Bug]: Unitview.lua hardcodes missile enhancement slots

### Describe the Bug

https://github.com/FAForever/fa/blob/f2448bebad7fced8b4f72b07cc7fc115de72405f/lua/ui/game/unitview.lua#L230-L236

These enhancement slots and names are hardcoded, which will cause issues for modded units that probably don't know about this convention.

### Reproduce the bug

Code a missile enhancement that uses a different slot or enhancement name.

### Screenshots

_No response_

### Additional context

Can be fixed by first searching through weapons for tactical/nuke weapons with silo ammo capacity and an `EnabledByEnhancement` field, then checking if the unit has the required enhancement for that weapon.