Theming: Remove now unused variable

Change-Id: Idddf0c3505875e2bb61106ced8692715619dc14b
Reviewed-by: Alessandro Portale <alessandro.portale@digia.com>
Theme: Delete on shutdown

Change-Id: I54a7122f72e3c13c239af1b4293b187cff5b1fd2
Reviewed-by: Thorben Kroeger <thorbenkroeger@gmail.com>
Reviewed-by: Alessandro Portale <alessandro.portale@digia.com>