Remove Ethan's binary-or comment

This comment was referring to a now-deleted variable named mkdirResult
that was binary-"or"ed with all mkdir() results... except for the saves
directory. That variable was only used for save file migration, which is
now axed, so this comment is referring to nothing now.

I don't really know the answer to Ethan's question, but it doesn't
matter now.

desktop_version/src/FileSystemUtils.cpp

@@ -122,7 +122,7 @@ int FILESYSTEM_init(char *argvZero, char* baseDir, char *assetsPath)
         "saves",
         pathSep
     );
-    mkdir(saveDir, 0777); /* FIXME: Why did I not | this? -flibit */
+    mkdir(saveDir, 0777);
     vlog_info("Save directory: %s", saveDir);
 
     /* Store full level directory */