Base costs warning in newsletter only on the checkbox

website/newsletters/templates/newsletters/email.html

@@ -96,7 +96,7 @@
                     <td style="{{ item_tr_style }}">
                         {{ item.description|safe }}
 
-                        {% if item.newsletterevent.price != 0 and item.newsletterevent.show_costs_warning %}
+                        {% if item.newsletterevent.show_costs_warning %}
                             <p style="font-family: Arial, sans-serif">
                                 <i><b>{% trans "Attention" %}:</b> {% trans "Registration deadline = unregistration deadline" %}!
                                 {% trans "Thalia will recover the costs on you if you do not unregister on time" %}.

website/newsletters/templates/newsletters/email.txt

@@ -11,7 +11,7 @@
 
 {% for item in newsletter.newslettercontent_set.all %}{{ item.title|upper }}:
  {{ item.description|striptags }}
- {% if item.newsletterevent %}{% if item.newsletterevent.price != 0 and item.newsletterevent.show_costs_warning %}
+ {% if item.newsletterevent %}{% if item.newsletterevent.show_costs_warning %}
  {% trans "Attention" %}: {% trans "Registration deadline = unregistration deadline" %}! {% trans "Thalia will recover the costs on you if you do not unregister on time" %}. {% if item.newsletterevent.penalty_costs and item.newsletterevent.penalty_costs > 0 %}{% trans "These costs are" %}: €{{ item.newsletterevent.penalty_costs }}.{% endif %}
 {% endif %}
  {% trans "What"|upper %}: {{ item.newsletterevent.what }}