Add eac3 as audio name format (#13784)

Emby.Naming/Common/NamingOptions.cs

@@ -238,6 +238,7 @@ namespace Emby.Naming.Common
                 ".dsp",
                 ".dts",
                 ".dvf",
+                ".eac3",
                 ".far",
                 ".flac",
                 ".gdm",