Non zip compression format detection doesn't seem to work (with fix)

[Levoila]

Hi,

I had a 7z file to extract but SevenZipExtractor::DetectCompressionFormat would think that the format was CompressionFormat::Lzma86 instead of CompressionFormat::SevenZip.

The format is detected is by trying to open the archive with each type consecutively until the archive opens correctly (link to source) but the file is not seeked to the beginning after each iteration, seemingly leading to no/incorrect detection for all but zip formats.

Seeking the file to the beginning before each iteration with fileStream->Seek({}, STREAM_SEEK_SET, nullptr); seems to fix the issue.

[getnamo]

Interesting catch, seems like you know where to place the fix, if you make a pull request I'll merge it :)

[getnamo]

merged #46