Fields: Update "Trash" translation to provide verb context

[aduth]

What?

Updates the translation of the word "Trash" to use _x to provide translator context that the word should be translated as a verb.

Follow-up to #72596 (see https://github.com/WordPress/gutenberg/pull/72596/files#r2481181750)

Why?

• Since "Trash" can be either a verb or a noun, and may be translated differently as a result
• For consistency / reuse of the same translation further down in the same component

Testing Instructions

Repeat Testing Instructions from #72596

[github-actions]

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Co-authored-by: aduth <[email protected]>
Co-authored-by: Mamaduka <[email protected]>

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[Mamaduka]

Thanks, @aduth!