nadditional css for input type submit

source/_patterns/02-base/02-html-elements/27-input/input--submit.twig

 {% include '@base/02-html-elements/27-input/input.twig' with {
     'type': type,
-    'value': value
+    'value': value,
+    'classes': 'uw-input--submit'
 } %}
\ No newline at end of file

source/_patterns/04-components/mailman-subscription/mailman-subscription.twig

@@ -11,8 +11,7 @@
       } %}
       {% include '@base/02-html-elements/27-input/input--submit.twig' with {
         'type': 'submit',
-        'value': 'Subscribe',
-        'classes': 'uw-input--submit uw-input--medium'
+        'value': 'Subscribe'
       } %}
     </div>
   </form>