Allow statusbar to grow backwards, so it can display smaller values after bigger ones.

Reference: /n/sources/patch/applied/statusbar-backwards
Date: Fri Jul  4 00:30:01 CES 2008
Signed-off-by: olegfink@gmail.com

--- /sys/src/cmd/aux/statusbar.c	Fri Jul  4 00:28:49 2008
+++ /sys/src/cmd/aux/statusbar.c	Fri Jul  4 00:28:45 2008
@@ -83,8 +83,12 @@
 	}
 
 	if(last != i){
-		draw(screen, Rect(rbar.min.x+last, rbar.min.y, rbar.min.x+i, rbar.max.y),
-			dark, nil, ZP);
+		if(i > last)
+			draw(screen, Rect(rbar.min.x+last, rbar.min.y, rbar.min.x+i, rbar.max.y),
+				dark, nil, ZP);
+		else
+			draw(screen, Rect(rbar.min.x+i, rbar.min.y, rbar.min.x+last, rbar.max.y),
+				light, nil, ZP);
 		last = i;
 	}
 	flushimage(display, 1);