WINTERMUTE: Fix assertion in Hamlet game

Assertion was caused by providing "saves/" prefixed string to
WindowsFilesystemNode::getChild() function, that asserts on '/'
characters.

Wintermute game code:
if(!(Game.FileExists((Game.SaveDirectory + "\gamelet.save")))) {
Directory.Create(Game.SaveDirectory);
}
...

Assertion stack:
from C:\WINDOWS\System32\KernelBase.dll
from C:\WINDOWS\System32\msvcrt.dll
(this=0xcfdf710,
n=...) at backends/fs/windows/windows-fs.cpp:158
n=...)
at common/fs.cpp:68
(filename=...)
at engines/wintermute/base/file/base_disk_file.cpp:76
at engines/wintermute/base/file/base_disk_file.cpp:105
this=0x50795e0, filename=...)
at engines/wintermute/base/base_file_manager.cpp:326
(this=0xcea72f0,
script=0xcf657d0, stack=0xcf6a2e0, thisStack=0xcf69ee0,
name=0xcfd8870 "FileExists") at
engines/wintermute/base/base_game.cpp:1523
...

0 files changed, 0 insertions, 0 deletions