DVB: Add event name to the window title when available.

- Change logic when ParseEIT fails.
- Change UpdatePSI to not search for channel again.
BD: Open index.bdmv directly by internal LAV and let it select playlist.
Fix DXVA status for some decoders after 4a79186.

Checking status only once is not reliable.
Even LAV Video Decoder can disable HW decoding on fly except DXVA Native mode.
Show HW decoder name in status bar.