Motivation / Problem

In #8401 introduced a bug when checking the direction of road stations.

Description

Standard dead-end road stations can only be entered from ReverseDiagDir(road_dir), but drive-through stations can also be entered from road_dir itself.

Also, I added the town t parameter to the function description which I'd forgotten earlier.

Limitations

None.

Checklist for review

Some things are not automated, and forgotten often. This list is a reminder for the reviewers.

• The bug fix is important enough to be backported? (label: 'backport requested')
• This PR affects the save game format? (label 'savegame upgrade')
• This PR affects the GS/AI API? (label 'needs review: Script API')
  • ai_changelog.hpp, gs_changelog.hpp need updating.
  • The compatibility wrappers (compat_*.nut) need updating.
• This PR affects the NewGRF API? (label 'needs review: NewGRF')
  • PR must be added to API tracker