riched20: accept middle click as paste (like edit control does)

[Dan Kegel]

Some time ago, the edit control was changed to treat middle click as paste:
http://marc.info/?l=wine-cvs&m=95929620429558&w=2 aka
http://cvs.winehq.org/cvsweb/wine/controls/Attic/edit.c.diff?r1=1.43&r2=1.44

A user has complained that richedit boxes don't behave the same
way.  Any reason not to let richedit also treat middle click as paste?

The patch is wafer-thin...
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