[3.x] Update Android Editor default display scale

[m4gr3d]

Updates the editor display scale based on the device's scaled density

[m4gr3d]

I'm worried that on Android, the device's pixel density can be very high (3 or 4). This causes the editor to be at an unusable size by default on phones (the inspector will be cut off). On both devices I've tried (OnePlus 6 and Samsung Galaxy Fold 2), 2.0 was the optimal scale in terms of usability without having too many things cut off.

The automatically used editor scale value within should probably be capped at 2.0 by default.

@Calinou 2.0 was the optimal scale because that's the actual density for the Fold 2 :)

I tested on several devices (emulator & actual phone) and using the scaled density is a good rule of thumb. For example, on a pixel 3 xl, 2.0 is too small, but 3.0 is just right, which is also the device's scaled density :)

Given we're still in alpha, let's go with the scaled density approach. We can revise (or cap it) if we receive issues and reports that it's unusable on certain devices.

[akien-mga]

Thanks!