Fixes #8045

Motivation / Problem

See #8045 (comment) for the analysis.

Description

CheckCompanyHasMoney() was also executed when not using DC_EXEC,
resulting in an error about shortage of money instead of the
estimation.
This mostly is a problem for AI players, as they will have no
way to know how much it would have cost.

PS: this bug is 14 years old :D

Limitations

• This mostly affects AI writers .. should we mention this in the changelog of AIs?
• The other 5 CMD_NO_TEST functions use _additional_cash_required, but this approach seems pretty much worse than using CheckCompanyHasMoney. This makes me think it would be better to change these 5 to using CheckCompanyHasMoney too. But, if it ain't broken, don't fix it.

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')
  • newgrf_debug_data.h may need updating.
  • PR must be added to API tracker