(fix) Fix an incorrectly-named variable

[jwnasambu]

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• This PR has a title that briefly describes the work done including the ticket number. If there is a ticket, make sure your PR title includes a conventional commit label. See existing PR titles for inspiration.

For changes to apps

• My work conforms to the OpenMRS 3.0 Styleguide and design documentation.

If applicable

• My work includes tests or is validated by existing tests.
• I have updated the esm-framework mock to reflect any API changes I have made.

Summary

I changed the isSearchingConditions variable to isSearchingConcepts to match the mocked implementation of the useConceptLookup function.

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[jwnasambu]

@ibacher, @denniskigen, @Jexsie Kindly review my PR at your convinient time please!

[denniskigen]

Thanks for catching this, @jwnasambu!