Fix detection of Opus audio files with .opus instead of .ogg extension

[Steffen]

Opus audio files can be uploaded (and rendered as an audio player) when they have a ".ogg" extension. XenForo doesn't recognize them when they have the recommended ".opus" extension (https://en.wikipedia.org/wiki/Opus_(audio_format)). This is easy to fix.

Diff:

diff --git a/src/XF/App.php b/src/XF/App.php
index 51395a939..7cf644589 100644
--- a/src/XF/App.php
+++ b/src/XF/App.php
@@ -349,6 +349,7 @@ class App implements \ArrayAccess
             return [
                 'mp3' =>...

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