Bug in priority queue

[BuenoVini]

A bug was found in the priority queue.

If a user adds two songs on the queue (priority 0 and 1) and then the first one is being played, if they delete the second one and vote for it again, it's going to be a priority 0.

The reason seems to be related with verifying the CurrentlyPlayingVote and which Client voted for it.

Suggestion:
In EnqueueVote() in the SparkflyManager.cs change to:

if (priority == 0 && PreviouslyPlayedVotes.Any(v => v.Client.Id == client.Id) && CurrentlyPlayingVote.Client.Id != client.Id)
    priority = 1;