Remove unnecessary feedback message from WP_Importer::is_user_over_quota().

fixes #32021.

git-svn-id: https://develop.svn.wordpress.org/trunk@33008 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/includes/class-wp-importer.php

@@ -228,7 +228,6 @@ class WP_Importer {
 	public function is_user_over_quota() {
 		if ( function_exists( 'upload_is_user_over_quota' ) ) {
 			if ( upload_is_user_over_quota() ) {
-				echo "Sorry, you have used your upload quota.\n";
 				return true;
 			}
 		}