fix: don't force 96 dpi

[Nerixyz]

Setting AA_Use96Dpi would fix fonts to a specific pixel/point size (usage in Qt). We want the fonts to scale and use the scale provided by the OS. I only tested this on Windows.

Fixes #5411.

Tests

The following tests should be done for each platform and configuration:

1. Dragging across screens of equal High-DPI scaling (if >1 screens) - are there issues or window size changes?
2. Saving on each screen - does the window appear at the same size when launched again?
3. Are the fonts reasonably sized compared to other apps?
4. Zooming in and out - does this look reasonable? Does saving work?

Platforms and Setups

• Windows
  • Single-monitor
    • 100% scale
    • >100% scale
  • Multi-monitor
    • all 100% scale
    • all >100% scale (but equal)
    • all >100% scale (different)
    • some 100%, some >100% scale
    • At least two setups from the linked issue (not sure what the exact cause is, probably the monitor)
• macOS
  • 100% scale
  • >100% scale (on a laptop)
• Linux
  • x11
    • 100% scale
    • >100% scale
  • Wayland
    • 100% scale
    • >100% scale

[pajlada]

Good catch!

Linux (Wayland w/ sway), 100% monitor

Text renders the same, icons render slightly different but only better from what I can tell

Linux (Wayland w/ sway), 150% monitor

Text is aliased differently, but I'm not 100% sure if this is due to screenshots scaling weirdly on sway. When I look at the monitor itself, everything looks very good still. Nothing has changed significantly in size.

macOS 200% monitor

Tab text size, Tab size, and chat text size are all smaller with this change. It's more in line with other texts (text input & chat header). Text still looks sharp. Overall I think this change is fine on macOS, but I could do more thorough testing in settings & menus to see if anything changes there.

macOS 100% monitor

Not tested yet