Codechange: do not declare functions in blocks

[rubidium42]

Motivation / Problem

CodeQL alerting about functions being declared in blocks. Specifically that even if you declare them in a block, they will become available globally.

Description

Either remove it because it was already declared outside the block, move it to the "global" scope of the cpp file or add the function to a reasonably appropriate header file.

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 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, gs_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

[2TallTyler]

All looks good to me, just one tiny nitpick. 🙂