Incorrect behavior for deleting a song with duplicates

[bwoodbury3]

A couple of related bugs with deleting tracks from the queue as a party admin. The logic for deletion should be fixed.

Bug #1:

1. Create a party
2. Search and add two of the same song
3. Click on and delete one of the songs

Expected behavior: only one of the songs deletes
Actual behavior: both songs are deleted

Bug #2:

1. Create a party one one device. Join the party from another device.
2. From either device, add a song (call this song Join party screens #1). Add a different song (call this song Queue songs #2). Then add song Join party screens #1 again. The queue should be [song Join party screens #1; song Queue songs #2; song Join party screens #1]
3. From the admin device, delete the third track in the list, which should be the second instance of song Join party screens #1.

Expected behavior: On both devices, the queue should be [song #1; song #2]
Actual behavior: On the guest device, the queue is [song #2; song #1] (the first instance is deleted); on the admin device, the queue is only song #2.