fix #6656 pageContainer: dynamic injected pages missing remove bindings

Fixes #6656

This will allow JQM to remove dynamically injected pages from the DOM.

When dynamically injecting a page, inside `pageContainer` widget, the `page` to transition to is injected into the DOM, thus JQM will not fire an ajax request to fetch it. This will prevent `_loadSuccess()` from being called, which prevents `_include()` from being called, which sets the `remove` binding on the page being loaded. 

Same as inside `_include()` the new page is enhanced first and then bound to.