Fix wrong params url when removing the search text from search block

[iFlameing]

Fixes #5614 .

@sneridagh This is the same fix for the auto-populated issue. We just missed one case where we typed in the search box of searchblock and removed it.

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[ichim-david]

I'll test this tomorrow morning, alongside https://github.com/plone/volto/pull/5262 It would be great to get both fixes merged soon if we are at search block fixes.

[fredvd]

@iFlameing Status? (working on a search block implementation and checking for bugs, found this one)