Add container to templateResult

This closes https://github.com/select2/select2/issues/3222.

src/js/select2/results.js

@@ -501,7 +501,7 @@ define([
     var template = this.options.get('templateResult');
     var escapeMarkup = this.options.get('escapeMarkup');
 
-    var content = template(result);
+    var content = template(result, container);
 
     if (content == null) {
       container.style.display = 'none';