Fix MKCOL for IE11 as well

Using https://github.com/owncloud/core/pull/22274 we have to patch the
iedavclient.js as well.

core/js/files/iedavclient.js

@@ -39,7 +39,12 @@
 			for(ii in headers) {
 				xhr.setRequestHeader(ii, headers[ii]);
 			}
-			xhr.send(body);
+
+			if (body === undefined) {
+				xhr.send();
+			} else {
+				xhr.send(body);
+			}
 
 			return new Promise(function(fulfill, reject) {