Avoid concatenation error in recipe_pcrglobwb.yml

[bouweandela]

Description

Avoid a an error when concatenating cubes due to a different attribute in recipe_pcrglobwb.yml.

• Closes https://github.com/ESMValGroup/ESMValCore/issues/2425

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New or updated recipe/diagnostic

• [x] 🧪 Recipe runs successfully
• [x] 🧪 Figure(s) and data look as expected from literature

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