Fade the Perform OCR button when the linked file is broken

[ZiadAbdElFatah]

When a linked file is broken, performing OCR can't be run, but it's still shown in the menu

We need it to be faded like the other options.

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@imadityak has been unassigned from this issue.

[ansh-rajpoot]

hey @koppor I would like to work on this issue. Can you please assign it to me...

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👋 Hey @ansh-rajpoot, looks like you’re eager to work on this issue — great! 🎉 It also looks like you don't know how to assign issues to yourself. Please read our CONTRIBUTING.md to find out how. It will also guide you in other aspects of contributing to JabRef.