RICHED20: EM_SETCHARFORMAT must return 1 on success, not 0

[a_villacis at palosanto.com]

With tests to prove it. Also documented on MSDN. Should help on bug #1713,
and probably also on bug #4058.

Changelog:
* EM_SETCHARFORMAT must return 1 on success, not 0.
* Add tests for this behavior.
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