[BUGFIX] Do not set music_directory in prebuilt presets (#783)

New music prebuilt presets had set `music_directory`, which is bad practice since it's not visible to the user which directory it would use. This forces `music_directory` to be set either in the user's config or subscription file

src/ytdl_sub/prebuilt_presets/music/music.yaml

@@ -32,6 +32,9 @@ presets:
         - "{track_genre}"
 
     overrides:
+#   MUST DEFINE:
+#     music_directory
+
       # Subscription overrides
       subscription_indent_1: "Unset"  # genre
       url: "{subscription_value}"
@@ -48,7 +51,6 @@ presets:
       track_genre: "{subscription_indent_1}"
 
       # Directory Overrides
-      music_directory: "/music"
       artist_dir: "{track_artist_sanitized}"
       album_dir: "[{track_year}] {track_album_sanitized}"
       track_file_name: "{track_number_padded} - {track_title_sanitized}.{ext}"

tests/unit/prebuilt_presets/test_prebuilt_presets.py

@@ -360,6 +360,7 @@ class TestPrebuiltMusicPresets:
                     music_preset,
                 ],
                 "overrides": {
+                    "music_directory": "/music",
                     "subscription_value": "https://your.name.here",
                 },
             },