could also compare using data-action.
{% if comparator == wk-delete-icon %}}
{% else %}
my class
class="wk-app-btn tt-btn-wishlist wlbutton-js{% if template.suffix == "wishlist" %} wk-delete-icon{% endif %}">
data-action
data-action="{% if wl_text %}wk-remove{% else %}wk-add{% endif %}"