joy.cpl: minor fix, do not declare hand written array, use WC_BUTTONW macro from COMMCTRL.H

[carlo.bramix at libero.it]

Instead of declaring an array of wide chars for the button class name, you can use the WC_BUTTON macro provided by COMMCTRL.H.
Nothing changed in the generated CPL applet.

Sincerely,

Carlo Bramini.

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