change block personcontent to content more consistent with other templates and less need for if-statements

src/Bundle/ChillEventBundle/Resources/views/Event/listByPerson.html.twig

@@ -21,7 +21,7 @@
 
 {% block title %}{{ 'Events participation' |trans }}{% endblock title %}
 
-{% block personcontent %}
+{% block content %}
 <h2>{{ 'Events participation' |trans }}</h2>
 
 <table class="table table-striped table-bordered mt-3 events">