Removed obsolete line of JavaScript causing client-side code not to run.

TrafficLightsSignalR/wwwroot/js/lights.js

@@ -7,9 +7,6 @@ var nextUpdateTime = null;
 
 var connection = new signalR.HubConnectionBuilder().withUrl("/lightHub").build();
 
-//Disable the send button until connection is established.
-document.getElementById("sendButton").disabled = true;
-
 connection.on("ReceiveStateUpdate", function (stateData) {
     console.log("Update pushed.");
     updateView(stateData);