Removed form_style from fieldset template. (#175)

Author: zarganum

crispy_bootstrap5/templates/bootstrap5/layout/fieldset.html

@@ -1,5 +1,5 @@
 <fieldset {% if fieldset.css_id %}id="{{ fieldset.css_id }}"{% endif %} 
-    {% if fieldset.css_class or form_style %}class="{{ fieldset.css_class }} {{ form_style }}"{% endif %}
+    {% if fieldset.css_class %}class="{{ fieldset.css_class }}"{% endif %}
     {{ fieldset.flat_attrs }}>
     {% if legend %}<legend>{{ legend|safe }}</legend>{% endif %}
     {{ fields|safe }}