Bug#1004104: [qt5-gtk-platformtheme] HiDPI support

[Lyndon Brown <jnqnfe@gmail.com>]

Package: qt5-gtk-platformtheme
Version: version 5.15.2+dfsg-14

I just installed this to see whether or not it would help enable an in-
development Qt app adapt to the Gnome system theme. (Please consider
packaging qgnomeplatform from [1]).

I noticed that there seems to be an issue with HiDPI with this package,
with various GUI text components being too large in that app with this
package installed.

[1]: https://github.com/FedoraQt/QGnomePlatform