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Loopy: make line thicknesses scale with the canvas.

This is now important due to Ben's changes in the web frontend. On
high-DPI displays, the canvas is the same overall size as before, but
it's scaled up by increasing the game's tilesize rather than the
browser scaling the image after the game redraws.

Loopy ought to have been scaling its line thicknesses all along, but
forgot. Easily fixed.

--- a/loopy.c

+++ b/loopy.c

@@ -3295,7 +3295,7 @@

 	if (draw_faint_lines)

 	    draw_line(dr, x1, y1, x2, y2, line_colour);

     } else {

-	draw_thick_line(dr, 3.0,

+	draw_thick_line(dr, ds->tilesize*3/32.0,

 			x1 + 0.5, y1 + 0.5,

 			x2 + 0.5, y2 + 0.5,

 			line_colour);

@@ -3310,7 +3310,7 @@

     int x, y;

     grid_to_screen(ds, g, d->x, d->y, &x, &y);

-    draw_circle(dr, x, y, 2, COL_FOREGROUND, COL_FOREGROUND);

+    draw_circle(dr, x, y, ds->tilesize*2/32.0, COL_FOREGROUND, COL_FOREGROUND);

 }

 static bool boxes_intersect(int x0, int y0, int w0, int h0,