Adding missing paginator when listing all stock locations

Current implementation only list all stock locations limited
by the defaulted per page value, but there's no way to navigate
to multiple pages.

backend/app/controllers/spree/admin/stock_locations_controller.rb

@@ -13,6 +13,10 @@ def set_country
  flash[:error] = t('spree.stock_locations_need_a_default_country')
  redirect_to(admin_stock_locations_path) && return
  end
+
+ def collection
+ super.page(params[:page]).per(Spree::Config[:admin_products_per_page])
+ end
  end
  end
 end

backend/app/views/spree/admin/stock_locations/index.html.erb

@@ -16,6 +16,7 @@
 <% end %>
 
 <% if @stock_locations.any? %>
+ <%= paginate @stock_locations, theme: "solidus_admin" %>
  <table class="index sortable" id='listing_stock_locations' data-hook data-sortable-link="<%= update_positions_admin_stock_locations_url %>">
  <colgroup>
  <col style="width: 10%">
@@ -69,6 +70,7 @@
  <% end %>
  </tbody>
  </table>
+ <%= paginate @stock_locations, theme: "solidus_admin" %>
 <% else %>
  <div class="no-objects-found">
  <%= render 'spree/admin/shared/no_objects_found',