Remove a dollar sign from the amount sent to auth.net.

authorizenetwebform.module

@@ -234,6 +234,7 @@ function authorizenetwebform_webform_client_form_submit($form, &$form_state) {
 
   // Get the amount.
   $amount_key = $flipped_map['x_amount'];
+  $amount = str_replace('$', '', $amount);
   $amount = $field_values[$amount_key];
 
   // Special handling for quantity.