Data packs with tempos non-divisible by 0.25 aren't exported properly

[Bentroen]

In 3.9.1, exporting a song with a tempo that's not a multiple of 0.25 causes the speed score to be set to a decimal value, which makes the load function invalid and prevents the data pack from loading at all.

https://github.com/HielkeMinecraft/OpenNoteBlockStudio/blob/ec65d3836e428f1da118782f367ba3b09f629cf4/scripts/datapack_export/datapack_export.gml#L26

A quick fix is to round the playspeed value to the nearest integer. However, a more "proper" fix would be to increase the tick step score from 80 to 2000 across the whole datapack, so any t/s value in steps of 0.01 is supported.