* (bug 27170) [Installer] Install now completes when choosing a CC license with the...

* (bug 27170) [Installer] Install now completes when choosing a CC license with the picker

There were two things breaking this:
* X-Frame-Options forbade our final step of the license selector, or the license selection shower, from being loaded properly. This lead to it looking wrong.
* The installation URL fingerprinting broke on the long query string that's on the final step. As a result, the user's selection got saved into a different session subkey, thinking it belonged to a different installation. It would then not get seen by the surrounding page's installer instance, causing the confusion.

Fix removes the X-Frame-Options for the CC bit, and drops query strings before the rest of URL normalization in the fingerprint check so the CC bits now see the same session key as the rest.