title: Remove WooCommerce metaboxes on product edit page
body: <p>I want remove some metaboxes from the product edit page.
  The code that I use is settled in functions.php</p>
  <pre><code>add_action( 'add_meta_boxes', function() { 
      remove_meta_box( 'postexcerpt', 'product', 'normal' );
      remove_meta_box( 'tagsdiv-product_tag', 'product', 'side' );
      remove_meta_box( 'postcustom', 'product', 'normal');
  }, 90);
  </code></pre>
  <p>The metaboxes <strong>postexcerpt</strong> and <strong>tagsdiv-product_tag</strong> are removed from the page but the <strong>postcustom</strong> metabox is still there. I tried also a higher prioritynumber but this fixed not the issue.</p>
  <p>Who can help me with this?</p>