Fix removing BZIP2 compression

[GregHib]

RemoveBzip2.kt breaks decompression on a few files meaning the client can't load 100% of the cache.

I suspect it's cause by https://github.com/Displee/rs-cache-library/blob/ec4c1bb7ad0b2166117d0720803e87a1609e1f20/src/main/kotlin/com/displee/cache/index/Index.kt#L79 trimming the revision, but if there's no revision it'll just trim the end of the data https://github.com/Displee/rs-cache-library/blob/ec4c1bb7ad0b2166117d0720803e87a1609e1f20/src/main/kotlin/com/displee/compress/CompressionExt.kt#L22.

Needs further investigation.