Entire program is huge on High DPI screen on Linux

[trgeiger]

When using KDE Plasma on an UHD XPS 13 laptop and Arch Linux, the program is huge. All other Qt applications on my system scale properly. I have my system set to use the KDE Plasma scaling of 2x.

Here's how it looks when opened:

Here's the Config menu:

[mdunc]

There's a fix for this in #329 which I tried (it's literally just a single line to change) and it made QtPass look perfect. I tagged @annejan on it, but I think it was missed.

[annejan]

I will take this in tomorrow . .

Thanks @mdunc