Make more font databases report fontsAlwaysScalable()

DirectWrite and CoreText supports scaling of non-scalable fonts.

Change-Id: I910c6a35e3d94c31efa9b26dd89bcb027951ac99
Reviewed-by: Miikka Heikkinen <miikka.heikkinen@theqtcompany.com>
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@theqtcompany.com>
Fix regression introduced by 8e3fdf13543f43d7a4cb4fa41f

Task-number: QTBUG-42963
Change-Id: Iaf2677a967ef424a3b781cdb2d3194d0e0e55333
Reviewed-by: aavit <eirik.aavitsland@theqtcompany.com>