Vista Style: More menu item pixel fixes for QtQuick Controls

Includes a one-pixel fix for widgets, where the menu item text
would be one pixel too far away from the vertical gutter.

Task-number: QTBUG-37451
Task-number: QTBUG-38376
Change-Id: I2539233814a427c5bed66a5c07584717eb3df418
Reviewed-by: Jens Bache-Wiig <jens.bache-wiig@digia.com>
Reviewed-by: Mitch Curtis <mitch.curtis@digia.com>
(cherry picked from qtbase/9cd2dac348f45c4b93f74f8ebe20d7528821f003)
Updated changes-4.8.6 file

Change-Id: Ia758818a9fcb716baeaf37c0fc37cb79c7974cf5
Reviewed-by: Jani Heikkinen <jani.heikkinen@digia.com>
Reviewed-by: Iikka Eklund <iikka.eklund@digia.com>
Reviewed-by: Akseli Salovaara <akseli.salovaara@digia.com>