Revert "fix BC break introduced by #2346 (sebastianbergmann/phpunit#2454)"

This reverts commit 62938bf.

Author: krakjoe

ext/dom/document.c

@@ -1628,9 +1628,6 @@ PHP_FUNCTION(dom_document_savexml)
 
 	doc_props = dom_get_doc_props(intern->document);
 	format = doc_props->formatoutput;
-	if (format) {
-		options = options | XML_SAVE_FORMAT;
-	}
 
 	buf = xmlBufferCreate();
 	if (!buf) {