Fix repeating groups issue. Simplify template and preprocess.

Closes #3487812

templates/layout-paragraphs-builder-component-menu--mercury-editor.html.twig

@@ -2,53 +2,11 @@
 {{ status_messages }}
 <div{{attributes}}>
 	<h4 class="visually-hidden">{{ 'Add Item'|t }}</h4>
-	{% if all_types|length > 0 %}
+	{% if count > 0 %}
 		<div class="lpb-component-list__search">
 			<input class="lpb-component-list-search-input" type="text" placeholder="Filter items..."/>
 		</div>
 		<div class="lpb-component-list__group">
-			{% if types.layout %}
-				<div class="lpb-component-list__group--layout">
-					<h3 class="lpb-component-list__group-label">{{'Layout'|t}}</h3>
-				{% endif %}
-				{% for type in types.layout %}
-					<div class="lpb-component-list__item type-{{type.id}} is-layout">
-						<a{{type.link_attributes.setAttribute('href',type.url)}}>
-							{% if type.image %}
-								<style>
-									.lpb-component-list__item.type-{{type.id}} a::before {
-										background: url({{ type.image }});
-										background-size: cover;
-									}
-								</style>
-							{% endif %}
-							{{ type.label }}</a>
-					</div>
-				{% endfor %}
-				{% if types.layout %}
-				</div>
-			{% endif %}
-			{% if types.content %}
-				<div class="lpb-component-list__group--content">
-					<h3 class="lpb-component-list__group-label">{{'Content'|t}}</h3>
-			{% endif %}
-			{% for type in types.content %}
-				<div class="lpb-component-list__item type-{{type.id}}">
-					<a{{type.link_attributes.setAttribute('href',type.url)}}>
-						{% if type.image %}
-						<style>
-							.lpb-component-list__item.type-{{ type.id }} a::before {
-								background: url({{ type.image }});
-								background-size: cover;
-							}
-						</style>
-						{% endif %}
-						{{ type.label }}</a>
-				</div>
-			{% endfor %}
-			{% if types.content %}
-				</div>
-			{% endif %}
 			{% for group in groups %}
 				{% if group.items|length > 0 %}
 				<div class="lpb-component-list__group--content">