[comctl32] monthcal - fix month/date selection when we click next/prev month - try 2

[Vijay Kiran Kamuju]

ChangeLog
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Monthcal - fix month/date selection when we click next/prev month

Note:
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This patch fixes bugno #6967
This patch reorganizes the certain message sequences, in conformance
with windows.
This has been observed using controlspy.
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