richedit: set dwError on invalid RTF. Fixes mono installer regression #12845

[Alex Villací­s Lasso]

Fixes bug #12845.

Changelog:
* On failure to parse incoming text as RTF, EM_STREAMIN must set dwError 
to -16. Fixes regression in Mono installer.

-- 
perl -e '$x=2.4;print sprintf("%.0f + %.0f = %.0f\n",$x,$x,$x+$x);'

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