riched20: fix modification state for several operations

[Clinton Stimpson]

Hi,

This patch fixes where the modification state is changed.
Note: keeping an incremental count is not necessary since undo isn't 
supposed to reset the modification flag.
This patch fixes bug 6005, and removes some todo_wine's.

Thanks,
Clinton Stimpson

ChangeLog
    Correct modification state with several operations.

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