Fix flake8 warnings

coderedcms/wagtail_hooks.py

@@ -4,7 +4,7 @@ from django.contrib.contenttypes.models import ContentType
 from django.templatetags.static import static
 from django.http.response import HttpResponse
 from django.urls import reverse
-from django.utils.html import format_html, mark_safe
+from django.utils.html import format_html
 from django.utils.translation import gettext_lazy as _
 from wagtail.admin.menu import MenuItem
 from wagtail.core import hooks