Revert "Increase max block size, improving performance and compression for high redundancy non-PNG files"
Revert "Increase max block size, improving performance and compression for high redundancy non-PNG files"

This reverts commit b23394077f8a7497dd95f499f3048f82b7c7ffc6. While this
commit improved compression on some files (notably all-zero files), it
introduced compression regressions on large text files.

fhanau/Efficient-Compression-Tool,fhanau/Efficient-Compression-Tool