music-assistant: fix running the built-in snapcast server (#452078)

diff --git a/music_assistant/providers/snapcast/__init__.py b/music_assistant/providers/snapcast/__init__.py

index 742d798183ec6fd1ac1fdbcad750912c222de5c3..8d0d95577d31f735977884280b08f384187774bd 100644

--- a/music_assistant/providers/snapcast/__init__.py

+++ b/music_assistant/providers/snapcast/__init__.py

@@ -87,7 +87,8 @@ DEFAULT_SNAPSTREAM_IDLE_THRESHOLD = 60000

 MASS_STREAM_PREFIX = "Music Assistant - "

 MASS_ANNOUNCEMENT_POSTFIX = " (announcement)"

 SNAPWEB_DIR = pathlib.Path(__file__).parent.resolve().joinpath("snapweb")

-CONTROL_SCRIPT = pathlib.Path(__file__).parent.resolve().joinpath("control.py")

+CONTROL_SCRIPT_DIR = pathlib.Path(__file__).parent.resolve()

+CONTROL_SCRIPT = CONTROL_SCRIPT_DIR.joinpath("control.py")

 DEFAULT_SNAPCAST_FORMAT = AudioFormat(

     content_type=ContentType.PCM_S16LE,

@@ -866,6 +867,10 @@ class SnapCastProvider(PlayerProvider):

         args = [

             "snapserver",

+            # defaults to /etc/snapcast.conf but needs

+            # to exist in order for snapserver to start

+            # https://github.com/badaix/snapcast/issues/1402

+            "--config=/dev/null",

             # config settings taken from

             # https://raw.githubusercontent.com/badaix/snapcast/86cd4b2b63e750a72e0dfe6a46d47caf01426c8d/server/etc/snapserver.conf

             f"--server.datadir={self.mass.storage_path}",

@@ -878,6 +883,7 @@ class SnapCastProvider(PlayerProvider):

             f"--stream.buffer={self._snapcast_server_buffer_size}",

             f"--stream.chunk_ms={self._snapcast_server_chunk_ms}",

             f"--stream.codec={self._snapcast_server_transport_codec}",

+            f"--stream.plugin_dir={CONTROL_SCRIPT_DIR}",

             f"--stream.send_to_muted={str(self._snapcast_server_send_to_muted).lower()}",

             f"--streaming_client.initial_volume={self._snapcast_server_initial_volume}",

         ]

    # Disable interactive dependency resolution, which clashes with the immutable Python environment

    ./dont-install-deps.patch

    # Fix running the built-in snapcast server

    ./builtin-snapcast-server.patch

  ];

  postPatch = ''