Template: Defining a default value for show_home breaks back compat.

To add a home link to the fallback menu output many themes only check if that
argument is set. Including Twenty Ten and Twenty Eleven. They check with
`isset()` so child themes and other instances using `wp_page_menu()` have a
chance to disable the home link by setting it to `false`.

Fixes #11095.



git-svn-id: https://develop.svn.wordpress.org/trunk@35737 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/post-template.php

@@ -1227,7 +1227,6 @@ function wp_page_menu( $args = array() ) {
 		'menu_class'  => 'menu',
 		'container'   => 'div',
 		'echo'        => true,
-		'show_home'   => false,
 		'link_before' => '',
 		'link_after'  => '',
 		'before'      => '<ul>',