fix macos ui scaling: fix defaults and rescaling

[redthing1]

issues:

• when run on macos right now, it double-scales everything so the UI looks ballooned.
• the 50%/100% scale presets do nothing on macOS

fixes:

• skip GLFW retina DPI when no override, to prevent launching at 2x on macos
• use font scale separately from style scale

this shouldn't affect anything for other platforms, just fixes macos

[pvande]

I've been building with this patch applied, and have found it helpful.

[redthing1]

yeah, it solves the issue for me. would be nice if it could be merged.

[wolfpld]

For a macos-only fix this does change a bit too much outside of the apple-specific code paths.

[redthing1]

@wolfpld i'm happy to bring it into alignment with what you expect, could you tell me how you'd prefer it to be done?

[slomp]

Have you folks tried a master branch build of the profiler, after the Dear ImGUI bump to 1.92.6?
a754bbe

I have not experienced the zoom issues anymore, and I can move the Tracy profiler window between the retina display and external displays (with no dpi scaling) without any wonkiness to the UI scaling.

[wolfpld]

This is fixed now?