riched20: (2/3) Implement ignoring of last \par for EM_STREAMIN - 1.0 emulation

[Alex Villací­s Lasso]

The last patch should have done this, but the stripping of the last line 
break should take into account that 1.0 line break is two characters.

Changelog:
* Instead of stripping the last line break character , strip the amount 
indicated by emulation (\r\n for 1.0)
* Add tests to show that 1.0 behavior is similar to 2.0 in that it 
ignores last \par
* Remove todo_wine's for riched32 tests that now succeed.

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

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