Widgets: When checking for errors in Custom HTML widget, pass correct value to `toggleClass()` for Save button.

`toggleClass()` expects a boolean as a second argument, not an integer.

Props iCaleb.
Fixes #42867.
Built from https://develop.svn.wordpress.org/trunk@42457


git-svn-id: http://core.svn.wordpress.org/trunk@42286 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/js/widgets/custom-html-widgets.js

@@ -215,7 +215,7 @@ wp.customHtmlWidgets = ( function( $ ) {
 				 * @returns {void}
 				 */
 				onUpdateErrorNotice: function onUpdateErrorNotice( errorAnnotations ) {
-					control.saveButton.toggleClass( 'validation-blocked disabled', errorAnnotations.length );
+					control.saveButton.toggleClass( 'validation-blocked disabled', errorAnnotations.length > 0 );
 					control.updateErrorNotice( errorAnnotations );
 				}
 			});

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.0-alpha-42453';
+$wp_version = '5.0-alpha-42457';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.