fixed isRequired partial

Author: denwehrle

src/templates/partials/isRequired.hbs

@@ -1,5 +1,5 @@
 {{~#if @root.useOptions~}}
 {{#unless isRequired}}?{{else if default}}?{{/unless}}
 {{~else~}}
-{{#unless isRequired}}?{{#unless default}}?{{/unless}}{{/unless}}
+{{#unless isRequired}}?{{#unless default}}{{/unless}}{{/unless}}
 {{~/if~}}