Better adhere to suggested Pretix view style

pretix_matrix_inviter/templates/pretix_matrix_inviter/settings.html

@@ -6,8 +6,10 @@
     <h1>{% trans "Matrix inviter" %}</h1>
     <form action="" method="post" class="form-horizontal">
         {% csrf_token %}
-        {% bootstrap_form_errors form %}
+        <fieldset>
+            <legend>{% trans "Matrix inviter settings" %}</legend>
             {% bootstrap_form form layout="horizontal" %}
+        </fieldset>
         <div class="form-group submit-group">
             <button type="submit" class="btn btn-primary btn-save">
                 {% trans "Save" %}

pretix_matrix_inviter/views.py

 from django.urls import reverse
+from pretix.base.models import Event
 from pretix.control.views.event import EventSettingsFormView, EventSettingsViewMixin
 
 from .forms import MatrixInviterForm
 
 
 class MatrixInviterView(EventSettingsViewMixin, EventSettingsFormView):
+    model = Event
+    permission = "can_change_settings"
     form_class = MatrixInviterForm
     template_name = "pretix_matrix_inviter/settings.html"