bulma (file, components): fix color fo icons: icons have no color specified anymore for a while, and use the color of parent elements. As they are often used in a `<a>` element (to work without javascript), they are often using a link color. This commit change a few icons to use a dark color instead.

{% extends 'base/base.html' %}
{% import 'input/xmlui.html' as xmlui with context %}

{% block body %}
<div id="tickets">
    {% for ticket in tickets %}
        <div class="ticket_full">
            {{ xmlui.generate(ticket) }}
        </div>
    {% endfor %}
</div>
{% endblock body %}