RICHED20: EM_SETCHARFORMAT must return 0, not assert, on invalid struct size

[a_villacis at palosanto.com]

Applies after previous patch (RICHED20: EM_SETCHARFORMAT must return 1 on
success, not 0). When native riched20 receives an invalid structure size,
it fails cleanly and returns 0. Builtin riched20 asserts unless this patch
is applied. With tests.

Changelog:
* EM_SETCHARFORMAT must not assert on invalid structure size. Instead, it
should just fail and return 0.
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