tomahawk: Update to bugfix release 0.8.2.

Fixes a few annoying bugs (in my case it's the painting issue that's
most annoying):

 * Show error message if saving tags failed.
 * Fixed painting issue on search page.
 * (OS X & Windows) Fixed crash during collection scan.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>