fix: arraywidget mobile button (#835)

Author: lukasvinclav

src/unfold/contrib/forms/templates/unfold/forms/array.html

@@ -26,7 +26,7 @@
     </template>
 
     <div class="flex flex-row">
-        <div x-on:click="items.push({ key: new Date().getTime()})" class="bg-primary-600 border border-transparent cursor-pointer font-medium inline-block px-3 py-2 rounded-md text-sm text-white w-full lg:w-auto">
+        <div x-on:click="items.push({ key: new Date().getTime()})" class="bg-primary-600 border border-transparent cursor-pointer font-medium inline-block px-3 py-2 rounded-md text-center text-sm text-white w-full lg:w-auto">
             {% trans "Add new item" %}
         </div>
     </div>