riched20.dll: Partially implement EM_PASTESPECIAL for CF_TEXT. Fixes bug 14530

[Arren Lex]

msdn says about WM_PASTE: Data is inserted only if the clipboard
contains data in CF_TEXT format.
So I have implemented the CF_TEXT format for EM_PASTESPECIAL for
programs that needlessly use PASTESPECIAL when they could just use
WM_PASTE, like in bug 14530

- Alex
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