Toolbar: $.mobile.navigate should trigger the back button

I encountered this issue when using $.mobile.navigate() to programmatically navigate to another page. I noticed that the data-add-back-btn attribute on the header widget did not work.

The back button shows up when I use $("body").pagecontainer("change", "#foo").

The affected line dates back to commit b3a8230 by @scottjehl

This commit adds a toolbar integration test that fails without the fix in place.