fdo#77059, hidpi: Increase the threshold of what DPI we consider hi-dpi.

Conflicts:
	vcl/source/window/window.cxx

Change-Id: I79802df4c11b3543140672419d78b697848b7c36
Reviewed-on: https://gerrit.libreoffice.org/8892
Tested-by: Caolán McNamara <caolanm@redhat.com>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>