MAPG-235 go back to start button added to the end of the challenge

public/static/css/game.css

@@ -153,6 +153,10 @@
     z-index: 2;
 }
 
+#goToStart {
+    display: none;
+}
+
 @media screen and (max-width: 599px) {
     #mapName {
         display: none;

public/static/js/game.js

@@ -301,7 +301,7 @@ const GameType = Object.freeze({ 'SINGLE': 0, 'MULTI': 1, 'CHALLENGE': 2 });
 
                     Game.transitToResultMap();
                     Game.showSummary();
-                    document.getElementById('continueButton').style.display = 'none';
+                    //document.getElementById('continueButton').style.display = 'none';
 
 
                 } else {
@@ -763,11 +763,13 @@ const GameType = Object.freeze({ 'SINGLE': 0, 'MULTI': 1, 'CHALLENGE': 2 });
             scoreInfo.children[1].style.display = 'block';
             document.getElementById('showSummaryButton').style.display = null;
 
-            if (!roomId || Game.multi.owner) {
+            if (Game.type == GameType.SINGLE || Game.multi.owner) {
                 document.getElementById('startNewGameButton').style.display = 'block';
                 if (!Game.readyToContinue) {
                     document.getElementById('startNewGameButton').disabled = true;
                 }
+            } else if (Game.type == GameType.CHALLENGE) {
+                document.getElementById('goToStart').style.display = 'block';
             }
 
             var resultBounds = new google.maps.LatLngBounds();