ply-utils: Increase threshold for guessed hiDPI scaling to >= 2880x1620

ply-utils: Increase threshold for guessed hiDPI scaling to >= 2880x1620

1440 is only 33% more then FHD, so using 2x there is a bit too much and
leads to the spinner being much too large on e.g 27" monitors.

And on e.g. Dell ultrawide 34" 3440x1440 which are only 110 DPI this effect
is even worse.

Change the threshold to >= 2880x1620 to avoid using 2x scaling on 1440p
monitors. 2880x1620 is ~240DPI when used in a 14" laptop at which point
using 2x scaling is really necessary.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>