fix: remove unintended character in HTML

src/QUI/ERP/Order/SimpleCheckout/Steps/CheckoutBillingAddress.html

@@ -2,7 +2,7 @@
     <input type="radio" name="billing_address" value="same_as_shipping" checked/>
     <span>
         {locale group="quiqqer/order-simple-checkout" var="ordering.step.title.Billing.same"}
-    </span>s
+    </span>
 </label>
 <label class="quiqqer-simple-checkout-billing__entry">
     <input type="radio" name="billing_address" value="different"/>