http: Use pinned repo length for `per_page` unwrap instead of fixed number — radicle-explorer

This allows us to avoid querying the repo stats and relying on maybe bad routing tables and take the hardcoded pinned repo array in case of querying for pinned repos.

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         per_page,
     } = qs;
     let page = page.unwrap_or(0);
     let per_page = per_page.unwrap_or(10);
     let per_page = per_page.unwrap_or_else(|| match show {
         ProjectQuery::Pinned => ctx.profile.config.web.pinned.repositories.len(),
         _ => 10,
     });
     let storage = &ctx.profile.storage;
     let db = &ctx.profile.database()?;
     let pinned = &ctx.profile.config.web.pinned;