fix(ut99): use System directory for patch 469f and later (#5034)

Patch 469f no longer ships System64 and puts the 64-bit ucc-bin in System, so fresh installs failed with Executable was not found.

lgsm/config-default/config-lgsm/ut99server/_default.cfg

@@ -166,7 +166,7 @@ glibc="2.1"
 # Edit with care
 
 ## Game Server Directories
-systemdir="${serverfiles}/System64"
+systemdir="${serverfiles}/System"
 executabledir="${systemdir}"
 executable="./ucc-bin"
 servercfgdir="${systemdir}"