Remove dupliate email actions

Remove duplicate 'woocommerce_order_status_pending_to_processing' and
'woocommerce_order_status_pending_to_on-hold' email actions

woocommerce.php

@@ -520,7 +520,7 @@ public function init() {
 		add_action( 'admin_footer', array( $this, 'output_inline_js' ), 25 );
 
 		// Email Actions
-		$email_actions = array( 'woocommerce_low_stock', 'woocommerce_no_stock', 'woocommerce_product_on_backorder', 'woocommerce_order_status_pending_to_processing', 'woocommerce_order_status_pending_to_completed', 'woocommerce_order_status_pending_to_on-hold', 'woocommerce_order_status_failed_to_processing', 'woocommerce_order_status_failed_to_completed', 'woocommerce_order_status_pending_to_processing', 'woocommerce_order_status_pending_to_on-hold', 'woocommerce_order_status_completed', 'woocommerce_new_customer_note' );
+		$email_actions = array( 'woocommerce_low_stock', 'woocommerce_no_stock', 'woocommerce_product_on_backorder', 'woocommerce_order_status_pending_to_processing', 'woocommerce_order_status_pending_to_completed', 'woocommerce_order_status_pending_to_on-hold', 'woocommerce_order_status_failed_to_processing', 'woocommerce_order_status_failed_to_completed', 'woocommerce_order_status_completed', 'woocommerce_new_customer_note' );
 
 		foreach ( $email_actions as $action )
 			add_action( $action, array( $this, 'send_transactional_email') );