Search input now has the value of query parameter in dataset search page

[A-Souhei]

Description

The search parameter is now set as value of the search input

Closes https://github.com/fjelltopp/who-afro-ckan/issues/617

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• The GitHub ticket for this issue has been updated to "Ready to Review" or equivalent.
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• My code follows the general Fjelltopp documentation (see Confluence).
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[jonathansberry]

Can you confirm that this solution fixes the indicators page as well?