TINSEL: Revert the incorrect flagging of DW2 entries as CD versions

This reverts the changes done to the DW2 entries in commit d4a354c1.

We only distinguish between floppy and CD versions if a game had both a
CD and a floppy version released. DW2 was only released as a CD version,
so the extra flagging of the DW2 entries as CD was redundant, and caused
confusion regarding previous saved games to users that readded the DW2
detection entries after this change