Correct typo in default trans workspace name in pearl powder script

[RichardWaiteSTFC]

Description of work

Correct typo in default workspace name produced by pearl powder reduction with focus_mode="trans" introduced by #38344

There is no associated issue.

Report to: Nick Funnell (PEARL)

To test:

Follow instructions in #38344

This does not require release notes because bug introduced this release

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[robertapplin]

Thanks for fixing this, and apologies I didn't spot this previously! I followed the instructions and its working as described

No release note required because this bug was introduced after the previous stable release

[RichardWaiteSTFC]

Thanks for fixing this, and apologies I didn't spot this previously! I followed the instructions and its working as described

Thanks for quick review - no need to apologise it was my fault!