fix: add action to form tool

This allow to use form on django action

admin_action_tools/templates/admin/form_tool/action_form.html

@@ -39,6 +39,7 @@
   <input type="hidden" name="{{ action_checkbox_name }}" value="{{ obj.pk|unlocalize }}">
   {% endfor %}
 
+  <input type="hidden" name="action" value="{{ action }}">
 
   {% include "include/form.html" %}
   {% include "include/submit_row.html" %}