Revert "Add variables to the billing-block so they are updated when switching processors"

This reverts commit b9d5719.

Author: eileenmcnaughton

CRM/Core/Payment/OmnipayMultiProcessor.php

@@ -357,8 +357,7 @@ public function buildForm(&$form) {
         $jsVariables[$clientSideKey] = $this->_paymentProcessor[$key];
       }
     }
-
-    \Civi::resources()->addVars('omnipay', $jsVariables, 'billing-block');
+    CRM_Core_Resources::singleton()->addVars('omnipay', $jsVariables);
     if (is_array($regions)) {
       foreach ($regions as $region => $additions) {
         foreach ($additions as $addition) {