pagination: refactor page limits.

Refactor page limits to a) be explicitly listed in the User class (not
hidden away in the Danbooru config) and b) explicitly depend on the
CurrentUser (not implicitly by way of Danbooru.config.max_numbered_pages).

app/logical/pagination_extension.rb

@@ -3,7 +3,7 @@ module PaginationExtension
 
   attr_accessor :current_page, :records_per_page, :paginator_count, :paginator_mode
 
-  def paginate(page, limit: nil, max_limit: 1000, count: nil, search_count: nil)
+  def paginate(page, limit: nil, max_limit: 1000, page_limit: CurrentUser.user.page_limit, count: nil, search_count: nil)
     @records_per_page = limit || Danbooru.config.posts_per_page
     @records_per_page = @records_per_page.to_i.clamp(1, max_limit)
 
@@ -22,7 +22,7 @@ module PaginationExtension
     else
       @paginator_mode = :numbered
       @current_page = [page.to_i, 1].max
-      raise PaginationError if current_page > Danbooru.config.max_numbered_pages
+      raise PaginationError if current_page > page_limit
 
       paginate_numbered(current_page, records_per_page)
     end