playlist items added in syncplay-android are not marked as active for other people

[soredake]

1. Join room with someone.
2. Add something to playlist.
3. It will be marked active only for you.
   

[Et0h]

For reference, in the official Syncplay client the playlist behaviour is as follows:

• If you specify a file as you load Syncplay it will add it to the end of the playlist. If the playlist was empty it will switch to that file and set it as active, but if a different file was active it will switch the user to the current playlist item not the new one they just added. Opening a file once in Syncplay never automatically adds it to the playlist - you are expected to add the filelist to the playlist and then if necessary manually switch to it (or let it auto switch and set the file as active if the playlist is empty - see below).
• If you add a file to a blank playlist it will switch to the first item on the playlist and set it as active.
• If you load a file it will check to see if it is on the playlist and if it is it will switch the playlist to that file and set it as active.
• If you join a room with an existing playlist, it will try to load the currently selected/active file. Unless when loading you specified a different file to load which is in the playlist, and then it will switch the playlist to that item.
• If the file which is the current playlist item becomes available it will automatically switch to it - relevant if you didn't have the file when it switches but then you downloaded or renamed a file to match what the playlist was looking for.
• If you are playing a file on the playlist and delete a different item on the playlist or rearrange the playlist, it won't change the playlist selection and will keep playing the current file and consider it to still be the currently selected/active playlist item.
• If you delete the current playlist item, it will switch to the next item down and mark it as active.