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games/galaxy: avoid unnecessary calculations
It is not necessary to recalculate the center of the
screen every time.

--- a/sys/src/games/galaxy/galaxy.c

+++ b/sys/src/games/galaxy/galaxy.c

@@ -357,6 +357,7 @@

 	setcursor(mc, &zoomcursor);

 	oxy = mc->xy;

 	oscale = scale;

+	sc = screencenter();

 	for(;;) {

 		readmouse(mc);

 		if(mc->buttons != 2)

@@ -363,7 +364,6 @@

 			break;

 		d = subpt(mc->xy, oxy);

 		z = tanh((double)d.y/200) + 1;

-		sc = screencenter();

 		gsc = tovector(sc);

 		pause(0, 0);

 		scale = z*oscale;