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/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',