The "TempDatapack" folder does not get deleted after the datapack export

[cs127]

Describe the bug
A clear and concise description of what the bug is.

The "TempDatapack" folder does not get deleted after exporting a song to a datapack.
This would cause exporting any datapacks after that to have the previously exported songs in them,
even after closing and reopening OpenNBS.

To Reproduce
Steps to reproduce the behavior:

1. Export a song to a datapack
2. Export another song to a datapack
3. You can see that the second datapack has the first song in it as well, because the temp folder did not get deleted.

Expected behavior
A clear and concise description of what you expected to happen.

I assume that the TempDatapack folder should be deleted after each datapack export.