loadmap: Fix conf file save access mode

The plugin does not create the cfg file, but updates it if already existing.
No idea what's wrong, maybe it's permissions.

src/LoadMap.cpp

@@ -158,7 +158,7 @@ bool write_config_file(
     qstrncat(szIniPath, ".cfg", sizeof(szIniPath));
     szIniPath[sizeof(szIniPath) - 1] = '\0';
 
-    fh = qopen(szIniPath, O_CREAT|O_WRONLY|O_TRUNC);
+    fh = qopen(szIniPath, O_CREAT|O_WRONLY|O_TRUNC, S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP);
     if (fh == -1)
         return false;