richedit: paragraph may have multiple rows, which should possibly update nHeight.

[Alex Villací­s Lasso]

Paragraph may have multiple rows, which should possibly update nHeight. 
Otherwise, a paragraph with multiple rows might fail to make the 
scrollbar appear when displaying text. Fixes absence of scrollbar in 
Blitz3D Demo.

Changelog:
* Include rows too when updating total height of the richedit text.

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

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