Add missing opus as supported extension in audio file plugin

Signed-off-by: falkTX <falktx@falktx.com>

source/native-plugins/audio-file.cpp

@@ -22,7 +22,7 @@
 
 static const char* const audiofilesWildcard =
 #ifdef HAVE_SNDFILE
-    "*.aif;*.aifc;*.aiff;*.au;*.bwf;*.flac;*.htk;*.iff;*.mat4;*.mat5;*.oga;*.ogg;"
+    "*.aif;*.aifc;*.aiff;*.au;*.bwf;*.flac;*.htk;*.iff;*.mat4;*.mat5;*.oga;*.ogg;*.opus;"
     "*.paf;*.pvf;*.pvf5;*.sd2;*.sf;*.snd;*.svx;*.vcc;*.w64;*.wav;*.xi;"
 #endif
 #ifdef HAVE_FFMPEG