olevba: bug in decompression algorithm for raw chunks

[decalage2]

Bug reported by @DidierStevens:

oletools/oletools/olevba.py

Line 1372 in 49b35ec

decompressed_container.extend([compressed_container[compressed_current:compressed_current + 4096]])

The following code:

decompressed_container.extend([compressed_container[compressed_current:compressed_current + 4096]])

should be:

decompressed_container.extend(compressed_container[compressed_current:compressed_current + 4096])