time popup in themeTester raises exception

[peller]

click on the time in editable text and an exception occurs instead of seeing a popup you get stuck on line 264 in postCreate:

 var ew = this.editWidget = new cls(this.editorParams, this.editorPlaceholder);

(cls is null)

Looks like a missing require

[peller]

(In [11951]) Include TimeTextBox?. refs #4890, fixes #5505.