Update Transmute opt scripts with global.py changes

[MetBenjaminWent]

Are there any linked Issues or Pull Requests?

No response

Brief description

With Issue #49, we can likely remove some Transmute Opt scripts which may otherwise be duplication of the same simple identical script, with a few line change.

Further details of the issue.

No response

[MetBenjaminWent]

Relevant older SVN ticket: https://code.metoffice.gov.uk/trac/lfric_apps/ticket/906

[tom-j-h]

Please ignore my mention of this in another issue, I put the wrong number.