comctl32: header: send Unicode notifications if required (resend)

[Mikołaj Zalewski]

The header control sends ANSI notification even to Unicode parent 
controls what breaks some Unicode application - e.g. winefile. This 
patch fixes it.

This is a resend that combines the original patch and the later fix.

Changelog: make HEADER_SendHeaderNotify convert Unicode notification to 
ANSI for ANSI controls. Rename it to HEADER_SendHeaderNotifyT to 
emphasize it. Call HEADER_SendHeaderNotifyT with Unicode notification 
codes.
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