Don't resurrect a removed default image when changing colors in the Customizer. Props koopersmith, nacin. fixes #20448

git-svn-id: https://develop.svn.wordpress.org/trunk@21013 602fd350-edb4-49c9-b593-d223f7449a82

wp-includes/class-wp-customize-manager.php

@@ -312,6 +312,7 @@ final class WP_Customize_Manager {
 		$settings = array(
 			'values'  => array(),
 			'channel' => esc_js( $_POST['customize_messenger_channel'] ),
+			'backgroundImageHasDefault' => current_theme_supports( 'custom-background', 'default-image' ),
 		);
 
 		foreach ( $this->settings as $id => $setting ) {