Make all constructor signatures multiline

[MAILPOET-3732]

lib/Newsletter/Editor/PostContentManager.php

@@ -13,7 +13,9 @@ class PostContentManager {
   /** @var WooCommerceHelper */
   private $woocommerceHelper;
 
-  public function __construct(WooCommerceHelper $woocommerceHelper = null) {
+  public function __construct(
+      WooCommerceHelper $woocommerceHelper = null
+  ) {
     $wp = new WPFunctions;
     $this->maxExcerptLength = $wp->applyFilters('mailpoet_newsletter_post_excerpt_length', $this->maxExcerptLength);
     $this->woocommerceHelper = $woocommerceHelper ?: new WooCommerceHelper();