QSettings: On Windows if an existing key uses REG_EXPAND_SZ, then setting this value will cause it to be REG_SZ instead

QSettings: On Windows if an existing key uses REG_EXPAND_SZ, then setting this value will cause it to be REG_SZ instead, the fact it is REG_EXPAND_SZ should be preserved

See fex:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Environment