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Seems like client side filtering on prediction markets was added with
these 2 PRs:
- #30405
- #30154

This has caused Explore sections showing less than 6 items in multiple
cases. Why? Because we fetch 6 items and there is a high chance at least
one of them gets filtered out. To overcome this, we have updated the
request to use the default of 20 items instead of 6

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CHANGELOG entry: fix less than 6 items on explore predictions cp-7.80.0

Fixes: https://consensyssoftware.atlassian.net/browse/ASSETS-3308

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<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> **Low Risk**
> UI-only feed sizing and display cap in Explore predictions; no auth,
payments, or security paths.
>
> **Overview**
> Explore **predictions** carousels were showing fewer than six cards
because feeds only requested six markets while client-side filtering
dropped some results.
>
> **`usePredictionsFeed`**, **`useWorldCupPredictionsFeed`**, and
**`useExploreSearch`** no longer pass a six-item **`pageSize`**, so
underlying predict hooks use their default (20) and return a larger pool
after filtering. **`PredictionsCarouselSection`** still shows at most
six items by passing **`feed.data.slice(0, 6)`** into the horizontal
carousel. Tests were updated to stop expecting **`pageSize: 20`** on
explore search.
>
> <sup>Reviewed by [Cursor Bugbot](https://cursor.com/bugbot) for commit
36b7741. Bugbot is set up for automated
code reviews on this repo. Configure
[here](https://www.cursor.com/dashboard/bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

---------

Co-authored-by: sahar-fehri <sahar.fehri@consensys.net>