[clang-tidy] remove static in namespace

Found with readability-static-definition-in-anonymous-namespace

Signed-off-by: Rosen Penev <rosenp@gmail.com>

src/encoder/plugins/OpusEncoderPlugin.cxx

@@ -120,7 +120,7 @@ PreparedOpusEncoder::PreparedOpusEncoder(const ConfigBlock &block)
 		throw std::runtime_error("Invalid signal");
 }
 
-static PreparedEncoder *
+PreparedEncoder *
 opus_encoder_init(const ConfigBlock &block)
 {
 	return new PreparedOpusEncoder(block);