fix template path in compile handlebars

The templates path in example 04 changes from app/templates to apps/main/app/templates as there are 2 apps. Therefore, the handlebars compile task was not compiling the templates which resulted in a 500 error when viewing the app.

Steps to reproduce:
1. clone the repo
2. cd rendr/examples/04_entrypath
3. npm install
4. grunt server

Error:
In the terminal you'll see:
Running "handlebars:compile" (handlebars) task
>> Destination not written because compiled files were empty.

In the browser you'll get a 500.