Block Editor: Use navigation-overlay icon for

  template part areas.

  Updates the Navigation Overlay template part area in
  get_allowed_block_template_part_areas() to use the dedicated
  navigation-overlay icon, replacing the overlay placeholder value.

  The icon has been updated in @wordpress/icons and will be synced
  to Core with the final Gutenberg release.

  Props mikachan, get_dave.
  Fixes #64629.

git-svn-id: https://develop.svn.wordpress.org/trunk@61623 602fd350-edb4-49c9-b593-d223f7449a82

Author: getdave

src/wp-includes/block-template-utils.php

@@ -105,7 +105,7 @@ function get_allowed_block_template_part_areas() {
 			'description' => __(
 				'The Navigation Overlay template defines a full-screen overlay area that typically contains navigation links and can be toggled on and off.'
 			),
-			'icon'        => 'overlay',
+			'icon'        => 'navigation-overlay',
 			'area_tag'    => 'div',
 		),
 	);