RICHED20: Allow for Win98 behavior for return value of EM_REPLACESEL

[Alex Villací­s Lasso]

Win98's riched20 (version 2.0) and WinXP's riched20 (version 3.0) 
disagree on what to return from EM_REPLACESEL. The general rule seems to 
be that Win98's riched20 returns the number of characters *inserted* 
into the control (after required conversions), but WinXP's riched20 
returns the number of characters interpreted from the original lParam. 
Wine's builtin riched20 implements the WinXP behavior, but the tests 
should allow for Win98's behavior to remove a few test failures on Win98.

Changelog:
* Allow for Win98 behavior on the return value of EM_REPLACESEL. Fixes a 
few test failures on Win98.

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

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