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libdraw: fix wrong menusel() calculation for menuhit() (noticable with small fonts)

the text for a menu entry is drawn from:

y = textr.min.y + i*(font->height+Vspacing);

but we calculated the item from:

r = insetrect(textr);
i = (p.y - r.min.y) / (font->height+Vspacing);

the insetrect is wrong.

--- a/sys/src/libdraw/emenuhit.c

+++ b/sys/src/libdraw/emenuhit.c

@@ -68,7 +68,6 @@

 static int

 menusel(Rectangle r, Point p)

 {

-	r = insetrect(r, Margin);

 	if(!ptinrect(p, r))

 		return -1;

 	return (p.y-r.min.y)/(font->height+Vspacing);

--- a/sys/src/libdraw/menuhit.c

+++ b/sys/src/libdraw/menuhit.c

@@ -69,7 +69,6 @@

 static int

 menusel(Rectangle r, Point p)

 {

-	r = insetrect(r, Margin);

 	if(!ptinrect(p, r))

 		return -1;

 	return (p.y-r.min.y)/(font->height+Vspacing);

-- 

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