fix(YSP-697): Bypass extra div for image banner

The div that is inserted for the item seems to be modifying how the
image banner behaves, skipping the styling of it to match the grand
hero.  By creating this, it allows it to bypass this, picking up the
styles similar to the grand hero in Drupal.

templates/field/field--block-content--field-media--image-banner.html.twig

@@ -0,0 +1,3 @@
+{% for item in items %}
+  {{ item.content }}
+{% endfor %}