wbemprox: Add property 'Caption' to Win32_PnPEntity.
Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=56291
Note: On windows powershell something like "Get-WmiObject win32_pnpentity -property name" gives exact same results as "Get-WmiObject win32_pnpentity -property caption" so I used same string for caption as for name in the patch.