RICHED20: minimal fix for WM_SETTEXT without ES_MULTILINE style

[a_villacis at palosanto.com]

Minimal fix for insertion with WM_SETTEXT without ES_MULTILINE. Test
included. Removes two todo_wine's.

Changelog:
* WM_SETTEXT without ES_MULTILINE only inserts up to, but not including,
the first \r or \n in the text.
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