Fixing issues: #850, #912, #888

Fixed ordering problems by point value - issue #850 The list should look now like: https://i.imgur.com/nt0ouNb.png
Also fixed other small issue in $rootScope.getCurrentLeaderboard when room is still not loaded, and referenced variables are undefined.
Fixed issue #912 - problem with entering the room from the notification message.
Fixed issue #888 - problem with leaderboard table in the room summary page when there are more than 3 problems. It should look now like: https://i.imgur.com/c0lcpnF.png