[Mod] S3M: Only ignore O00 effects if the file has been identified as…

… being made with ST3.00/ST3.01. Several other tools identify as ST3.01 but they probably don't need this quirk (in particular UNMO3).

git-svn-id: https://source.openmpt.org/svn/openmpt/trunk/OpenMPT@21803 56274372-70c3-4bfc-bfc3-4c3a0b034d27

soundlib/Load_s3m.cpp

@@ -708,7 +708,7 @@ bool CSoundFile::ReadS3M(FileReader &file, ModLoadingFlags loadFlags)
  else if(m.param > 0x08)
  zxxCountRight++;
  }
- } else if(m.command == CMD_OFFSET && m.param == 0 && fileHeader.cwtv <= S3MFileHeader::trkST3_01)
+ } else if(m.command == CMD_OFFSET && m.param == 0 && isST3 && fileHeader.cwtv <= S3MFileHeader::trkST3_01)
  {
  // Offset command didn't have effect memory in ST3.01; fixed in ST3.03
  m.command = CMD_DUMMY;