Posts: Correctly pass $post to post_password_required() in get_the_excerpt().

Corrects the relevant test.

Props sebastian.pisula for initial patch.
Fixes #35486.
Built from https://develop.svn.wordpress.org/trunk@36329


git-svn-id: http://core.svn.wordpress.org/trunk@36296 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/post-template.php

@@ -372,7 +372,7 @@ function get_the_excerpt( $post = null ) {
 		return '';
 	}
 
-	if ( post_password_required() ) {
+	if ( post_password_required( $post ) ) {
 		return __( 'There is no excerpt because this is a protected post.' );
 	}