Remove snippets edit_header.html in favour of generic slim_header.html

This is now possible now that the slim_header.html template has the history icon link include

docs/releases/5.2.md

@@ -242,6 +242,7 @@ The templates for the snippets views have been refactored to reuse the shared `s
 
 - `wagtailsnippets/snippets/headers/_base_header.html`
 - `wagtailsnippets/snippets/headers/create_header.html`
+- `wagtailsnippets/snippets/headers/edit_header.html`
 - `wagtailsnippets/snippets/headers/history_header.html`
 - `wagtailsnippets/snippets/headers/list_header.html`
 - `wagtailsnippets/snippets/headers/usage_header.html`

wagtail/snippets/templates/wagtailsnippets/snippets/edit.html

@@ -3,7 +3,7 @@
 {% block titletag %}{% blocktrans trimmed with snippet_type_name=model_opts.verbose_name %}Editing {{ snippet_type_name }} - {{ object }}{% endblocktrans %}{% endblock %}
 {% block bodyclass %}{% if locked_for_user %}content-locked{% endif %}{% endblock %}
 {% block content %}
-    {% include 'wagtailsnippets/snippets/headers/edit_header.html' %}
+    {% include 'wagtailadmin/shared/headers/slim_header.html' %}
 
     {% include "wagtailadmin/shared/header.html" with title=object icon=header_icon merged=1 only %}
 

wagtail/snippets/templates/wagtailsnippets/snippets/headers/edit_header.html

@@ -1,9 +0,0 @@
-{% extends 'wagtailadmin/shared/headers/slim_header.html' %}
-{% load wagtailadmin_tags i18n %}
-
-{% block actions %}
-    {{ block.super }}
-
-    {# Object history #}
-    {% include "wagtailadmin/shared/headers/_history_icon_link.html" with history_url=history_url nav_icon_button_classes=nav_icon_button_classes nav_icon_classes=nav_icon_classes only %}
-{% endblock %}