Upgrade/Install: Fix the Install Now button in the plugin overlay when running WordPress on a specific port.

Props garrett-eclipse, pierlo, afragen.
Fixes #48077.
Built from https://develop.svn.wordpress.org/trunk@46348


git-svn-id: http://core.svn.wordpress.org/trunk@46147 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/js/updates.js

@@ -2416,7 +2416,7 @@
 		 */
 		$( window ).on( 'message', function( event ) {
 			var originalEvent  = event.originalEvent,
-				expectedOrigin = document.location.protocol + '//' + document.location.hostname,
+				expectedOrigin = document.location.protocol + '//' + document.location.host,
 				message;
 
 			if ( originalEvent.origin !== expectedOrigin ) {

wp-includes/version.php

@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.3-beta1-46347';
+$wp_version = '5.3-beta1-46348';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.