comctl32: send Unicode notifications for Unicode headers

[Mikołaj Zalewski]

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

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