riched20: Fix vertical scrolling

[Andrew O. Shadoura]

Hello.

The acfb6ea210c92ef9ff41dc6828f9482e9c6d6516 commit introduced new bug, that
can be reproduced by any program that uses RichEd20: if control has less than
one page of text, it can be scrolled past the last line of text, hiding all of
it completely.
The following patch fixes this.

Bugzilla link:
http://bugs.winehq.org/show_bug.cgi?id=14749

-- 
WBR, Andrew
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