Don't clear all of the pen_style, just the PS_STYLE_MASK. Seems to fix

Don't clear all of the pen_style, just the PS_STYLE_MASK. Seems to fix

2002-03-22  Tor Lillqvist  <tml@iki.fi>

	* gdk/win32/gdkgc-win32.c (gdk_win32_gc_set_dashes): Don't clear
	all of the pen_style, just the PS_STYLE_MASK. Seems to fix #74441,
	but that is just the special case of one-pixel wide one-pixel
	on-off dotted lines. To fully implement generic X11 style dashed
	lines a major rewrite would be needed.