Set application id as application name

qtwebkit stores its cache and storage data in the paths

* @{HOME}/.cache/<application name>
* @{HOME}/.local/share/<application name>

To avoid that all applications store their data in the same directory we set the
application id as application name to make sure each application gets its own storage
directory.

Signed-off-by: Simon Busch <morphis@gravedo.de>