RICHED20: EM_SETTEXTEX must support RTF strings too

[a_villacis at palosanto.com]

Another fix for Zoiper (www.zoiper.com). This app can display an About dialog
with a richedit control that displays program credits. The text is a RTF
string pasted with EM_SETTEXTEX, which should result in formatted text being
displayed, but instead results in raw display of RTF codes. The attached
patch fixes this.

Changelog:
* EM_SETTEXTEX should also support RTF strings, just like WM_SETTEXT
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