tidy up service xml to remove keyed collection

Author: PhilETaylor

src/Resources/config/services.xml

@@ -16,9 +16,7 @@
         <service id="webpack_encore.tag_renderer" class="Symfony\WebpackEncoreBundle\Asset\TagRenderer">
             <argument type="service" id="webpack_encore.entrypoint_lookup_collection" />
             <argument type="service" id="assets.packages" />
-            <argument type="collection">
-                <argument key="crossorigin" />
-            </argument>
+            <argument type="collection" />
         </service>
 
         <service id="webpack_encore.twig_entry_files_extension" class="Symfony\WebpackEncoreBundle\Twig\EntryFilesTwigExtension">