Add fractal scale detection for older logs

[Sejsel]

As of 2023-07-16, arcdps stores fractal scale numbers for fractals, but we can also detect the fractal scale for older logs, at the very least default encounters should be fairly simple. Support for non-standard encounter logs is probably also possible, but may be out of scope mainly due to lack of logs for testing.

Do not forget that Skorvald gets logged on any scale.