winecfg: simplify code by using SetDlgItemInt

[carlo.bramix at libero.it]

Attached patch:
- Replaces few SetWindowTextA/W+GetDlgItem with SetDlgItemTextA/W.
- Instead of declaring the format string, do an sprinf() and do a 
SetDlgItemText(), it could just use SetDlgItemInt().

Sincerely,

Carlo Bramini.
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