feat: disable 7.6 downmuxing by default.

I'm not confident that it works well enough to have it on, and not everyone needs it anyway.

Author: katiekloss

Jellyfin.Plugin.DoViRemux/Configuration/PluginConfiguration.cs

@@ -17,7 +17,7 @@ public class PluginConfiguration : BasePluginConfiguration
     /// </summary>
     public string PrimaryUser { get; set; } = string.Empty;
 
-    public bool DownmuxProfile7 { get; set; } = true;
+    public bool DownmuxProfile7 { get; set; } = false;
 
     public string PathToDoviTool { get; set; } = string.Empty;