Doc: Remove incorrect dependencies

Remove dependencies to nonexistent module 'qtbase'
from .qdocconf files.

Change-Id: If299d764a5c2e0d0d83551f74e30ead70c26aa10
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@digia.com>
Reviewed-by: Jerome Pasion <jerome.pasion@digia.com>