Fixes for Meilisearch extra

[molfar]

This PR fixes response format from Meilisearch mock object to match original one.

[codecov]

Codecov Report

Merging #318 (b48c8f6) into dev (755c9f1) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##               dev      #318   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           47        47           
  Lines         1837      1837           
=========================================
  Hits          1837      1837           

Impacted Files	Coverage Δ
lib/pagy/extras/meilisearch.rb	100.00% <100.00%> (ø)
test/mock_helpers/meilisearch.rb	100.00% <100.00%> (ø)

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[ddnexus]

That's the problem with mock classes :)
Thank you.