Flip 2022 field to be in correct orientation

Change-Id: I7a9a5b74048dc4e2dd97a47a90cb23cbe1053d49
Signed-off-by: James Kuszmaul <jabukuszmaul@gmail.com>
diff --git a/y2022/www/field_handler.ts b/y2022/www/field_handler.ts
index 22989be..88c2864 100644
--- a/y2022/www/field_handler.ts
+++ b/y2022/www/field_handler.ts
@@ -161,9 +161,12 @@
 
   drawField(): void {
     const ctx = this.canvas.getContext('2d');
+    ctx.save();
+    ctx.scale(-1.0, 1.0);
     ctx.drawImage(
         this.fieldImage, 0, 0, this.fieldImage.width, this.fieldImage.height,
         -FIELD_EDGE_X, -FIELD_SIDE_Y, FIELD_LENGTH, FIELD_WIDTH);
+    ctx.restore();
   }
 
   drawCamera(