Use a QScopeGuard to fix its restoration of left-to-right mode after completion.
Change-Id: I5ac1e44629e72d993f2d5ba6586b86508d57cdaf
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Andreas Buhr <andreas.buhr@qt.io>
Reviewed-by: Andrei Golubev <andrei.golubev@qt.io>