riched20: only WM_CHAR respects text limit

[Clinton Stimpson]

WM_CHAR respects text limit, but WM_SETTEXT and related do not.  Fixes bugs 
8156 and 8330.  Removing todo_wine's from tests.

Thanks,
Clinton Stimpson

ChangeLog:
    riched20: only WM_CHAR is restricted to text limit
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