Allow modifying dbus name with --audio-client-name

[mjsir911]

This allows for a combination of:

.mpv/config

[Music]
profile-cond=require 'mp.utils'.join_path(working_directory, path):match('tunes') ~= nil
audio-client-name=mpv-tunes

&

.config/rescrobbled/config.toml:

...
player-whitelist = ["mpv-tunes"]

To signal some data to be able to filter between different kinds of files being played by mpv.