sync.profile: Remove qtjsbackend

It's no longer a dependency.

Change-Id: I1002093df9f42b0b7dfacd0daa9f33889a997d43
Reviewed-by: Simo Fält <simo.falt@digia.com>
Reviewed-by: Laszlo Agocs <laszlo.agocs@digia.com>