Add Hidden cursor state flag on non-desktop platforms as well

[frenzibyte]

• Closes iOS/iPadOS native cursor overlaps with the in-game cursor #31233
• Related to osu!lazer "high precision mouse" mode is broken on iOS #22864

This makes the "high precision mouse" setting effective on iPadOS, however, raw mouse input is completely broke on iPadOS similar to macOS. The default value of the setting should be changed to false on such platforms anyway (ppy/osu-framework#6469).

This hides the little iPad system cursor that is shown along the menu cursor.

[peppy]

This makes the "high precision mouse" setting effective on iPadOS, however, raw mouse input is completely broke on iPadOS similar to macOS

I don't understand what you are saying here ("effective" in what way?), can you try rewording?

[frenzibyte]

osu! on iPad always had support for raw mouse input (since we switched to SDL3 at least), we just didn't add the CursorState.Hidden flag so it was being disabled internally in o!f's MouseHandler implementation.

Of course this is before I realise it's still broken support, not working support. However, it's still a good change to make to hide the system cursor etc.

[peppy]

Worth a try.