Customizer: Set a correct default for `nav_menu_locations` setting.

props westonruter.
fixes #33088.
Built from https://develop.svn.wordpress.org/trunk@33421


git-svn-id: http://core.svn.wordpress.org/trunk@33389 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/class-wp-customize-nav-menus.php

@@ -496,6 +496,7 @@ final class WP_Customize_Nav_Menus {
 					'theme_supports'    => 'menus',
 					'type'              => 'theme_mod',
 					'transport'         => 'postMessage',
+					'default'           => 0,
 				) );
 			}
 

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.3-beta4-33420';
+$wp_version = '4.3-beta4-33421';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.