Nav buoys should not show cargo

[Dez E]

For the X-Wing ruleset, nav buoys should not show the cargo, as this was not displayed in the original game and can contain junk information in the original campaign missions, e.g. TOD4M02 where they are set to 'Max'.

[Dez E]

Original display:

[Justagai]

There is a actually a value in the ship definitions table that defines whether a craft can have cargo or not. We should go off of this.

[Dez E]

Fix applied in development branch for this issue.