Display has_piece on the webpage

Change-Id: I81ff1c7a821e55c35207613f0045582f5ecb6175
diff --git a/y2019/vision/server/server.cc b/y2019/vision/server/server.cc
index 3ef8983..4d00cdf 100644
--- a/y2019/vision/server/server.cc
+++ b/y2019/vision/server/server.cc
@@ -244,6 +244,7 @@
       sensors->set_elevator(superstructure_status->elevator.position);
       sensors->set_intake(superstructure_status->intake.position);
       sensors->set_stilts(superstructure_status->stilts.position);
+      sensors->set_has_piece(superstructure_status->has_piece);
 
       ::std::string json;
       google::protobuf::util::MessageToJsonString(debug_data, &json);