join purposefully as spectator, various improvements

spec/e2e/game_spec.js

@@ -199,7 +199,7 @@ describe('game page', () => {
         it('should display the mod transfer modal, with the single spectator available for selection', () => {
             document.getElementById('mod-transfer-button').click();
             expect(document.querySelector('div[data-pointer="MGGVR8KQ7V7HGN3QBLJ5339ZL"].potential-moderator')
-                .innerText).toEqual('Matt');
+                .innerText).toContain('Matt');
             document.getElementById('close-mod-transfer-modal-button').click();
         });
 

spec/support/MockGames.js

@@ -163,7 +163,8 @@ export const mockGames = {
             paused: true,
             timeRemaining: 120000
         },
-        isFull: true
+        isFull: true,
+        spectators: []
     },
     moderatorGame:
         {