Fix 2fd9096: Label for fruit incorrectly changed to FRUI from FRUT.

[PeterN]

Motivation / Problem

When changing internal cargo types from numerical CT_* values to labels, I inadvertently changed FRUT to FRUI.

This breaks compatibility with NewGRFs using fruit.

Description

Fix FRUI to be FRUT as nature intended.

Limitations

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 touches english.txt or translations? Check the guidelines
• 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, game_changelog.hpp need updating.
  • The compatibility wrappers (compat_*.nut) need updating.
• This PR affects the NewGRF API? (label 'needs review: NewGRF')
  • newgrf_debug_data.h may need updating.
  • PR must be added to API tracker