Fix stack object overrun in ChooseFontA

[Troy Rollo]

CFn_WMInitDialog is setting the value of lParam (which is a CHOOSEFONTA rather 
than a CHOOSEFONTW) as the CHOOSEFONTW property for the dialog. It should be 
using lpcf, which is always a CHOOSEFONTW.

ChangeLog:
 Fix stack object overrun when an application calls ChooseFontA
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