GRIM: Fix MD5 sums for german versions.

These are the verified, correct checksums for most german disc versions
(after removal of the "copy protection" that is on some discs).

Please the the original MD5 forum thread for verification: http://forums.residualvm.org/viewtopic.php?t=215 - Here user desperadoduck, M[u]ddy and mark verify those MD5 sums as correct

Additionally, I can confirm those MD5 sums match with my own version. See also #796, where I try to explain how those incorrect MD5s ended up in the source code (probably a copy & paste error).