decrease size of file upload button

Author: jrief

formset/templates/formset/bootstrap/widgets/file.html

@@ -2,7 +2,7 @@
 {% load i18n %}
 
 {% block "choose-file" %}
-<button type="button" aria-controls="{{ widget.attrs.id }}" class="btn btn-outline-secondary">{% trans "Choose file" %}</button>
+<button type="button" aria-controls="{{ widget.attrs.id }}" class="btn btn-outline-secondary btn-sm">{% trans "Choose file" %}</button>
 {% endblock %}
 
 {% block "file-caption" %}