richedit: fix modify step setting in EM_SETCHARFORMAT.

[Alex Villací­s Lasso]

Fixes crash #2 with Perfect! TextEdit (bug #709)

Changelog:
* richedit: fix modify step setting in EM_SETCHARFORMAT.
* EM_SETCHARFORMAT with wParam==0 sets default char format and does NOT 
set modify step flag.
* EM_SETCHARFORMAT with wParam==SCF_SELECTION only sets modify step flag 
when selection is nonempty.
* EM_GETMODIFY returns -1, not 1, when modify flag is set.
* Tests for the above behavior.

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

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