Make camera targets larger on screen

Change-Id: I1716497fea3ac01ff1858748f1f7915eaac549f7
diff --git a/y2019/vision/server/www/robot.ts b/y2019/vision/server/www/robot.ts
index 71defb6..a106d5f 100644
--- a/y2019/vision/server/www/robot.ts
+++ b/y2019/vision/server/www/robot.ts
@@ -63,12 +63,15 @@
 
   ctx.restore();
 
+  ctx.save();
+  ctx.lineWidth = 3.0 * ctx.lineWidth;
+  ctx.strokeStyle = 'yellow';
   for (let frame of cameraFrames) {
     if (frame.targets) {
       for (let target of frame.targets) {
-        ctx.strokeStyle = 'yellow';
         drawTarget(ctx, target.x, target.y, target.theta);
       }
     }
   }
+  ctx.restore();
 }