Allow whitespace after first line of multiline macro

Fixes the remaining part of #482

core/modules/parsers/wikiparser/rules/macrodef.js

@@ -27,7 +27,7 @@ Instantiate parse rule
 exports.init = function(parser) {
 	this.parser = parser;
 	// Regexp to match
-	this.matchRegExp = /^\\define\s+([^(\s]+)\(\s*([^)]*)\)(\r?\n)?/mg;
+	this.matchRegExp = /^\\define\s+([^(\s]+)\(\s*([^)]*)\)(\s*\r?\n)?/mg;
 };
 
 /*