Disable swf decompression by default
SWF decompression currently relies on libhtp's LZMA decompressor. While discussing migration to libhtp-rs it was suggested that LZMA decompression in suricata could just depend on lzma-rs directly instead of having libhtp-rs expose a LZMA decompression interface.
While doing that PR, it was suggested that SWF decompression should eventually be removed entirely, since SWF is going away / gone. As a step towards that direction, SWF decompression should be disabled by default.
So this task is to disable SWF decompression by default.