power: Use app.html instead of simple_app.html

Signed-off-by: Sunil Mohan Adapa <sunil@medhas.org>
Reviewed-by: James Valleroy <jvalleroy@mailbox.org>

plinth/modules/power/templates/power.html

@@ -1,4 +1,4 @@
-{% extends "simple_app.html" %}
+{% extends "app.html" %}
 {% comment %}
 #
 # This file is part of FreedomBox.

plinth/modules/power/views.py

@@ -33,6 +33,7 @@ def index(request):
     return TemplateResponse(
         request, 'power.html', {
             'title': power.name,
+            'name': power.name,
             'description': power.description,
             'manual_page': power.manual_page,
             'pkg_manager_is_busy': _is_pkg_manager_busy()