Fix plots and provenance in Russell diagnostics

[schlunma]

Description

• Fixes recipe_russell18jgr.yml fails to run #3478

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New or updated recipe/diagnostic

• 🧪 Recipe runs successfully Not the entire recipe, but at least the affected diags
• 🧪 Recipe is well documented
• 🧪 Figure(s) and data look as expected from literature
• 🛠 Provenance information has been added

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[valeriupredoi]

@esmvalbot please run recipe_russell18jgr.yml

[esmvalbot]

Since @valeriupredoi asked, ESMValBot will run recipe recipe_russell18jgr.yml as soon as possible, output will be generated here

[esmvalbot]

ESMValBot is sorry to report it failed to run recipe recipe_russell18jgr.yml: exit is 1, output has been generated here

[bouweandela]

Thanks 🌟