Closes https://github.com/ppy/osu/issues/29492.
I'm not immediately sure why this happened, but some old locally
modified beatmaps in my local realm database have a `BeatDivisor` of 0
stored, which is then passed to
`BindableBeatDivisor.SetArbitraryDivisor()`, which then blows up.
To stop this from happening, just refuse to use values outside of a sane
range.
