Fix finite pagination with placeholder search

[ManyTheFish]

this bug is reproducible on real datasets and is hard to isolate in a simple test.

related to: https://github.com/meilisearch/meilisearch/issues/3200

poke @curquiza

[bors[bot]]

Build succeeded:

• Run Clippy
• Run Rustfmt
• Tests on macos-latest
• Tests on ubuntu-20.04
• Tests on windows-latest