Taxonomy: Disallow overriding the name property when registering a taxonomy.

Props wpfo for initial patch.
Fixes #39308.
Built from https://develop.svn.wordpress.org/trunk@40049


git-svn-id: http://core.svn.wordpress.org/trunk@39986 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/class-wp-taxonomy.php

@@ -333,6 +333,8 @@ final class WP_Taxonomy {
 			}
 		}
 
+		$args['name'] = $this->name;
+
 		foreach ( $args as $property_name => $property_value ) {
 			$this->$property_name = $property_value;
 		}