LibAudio: Use new format functions.

Author: https://github.com/asynts
Commit: 805ed03b48
Pull-request: https://github.com/SerenityOS/serenity/pull/3776
Reviewed-by: https://github.com/alimpfard

Libraries/LibAudio/WavWriter.cpp

@@ -53,7 +53,7 @@ void WavWriter::set_file(const StringView& path)
 {
     m_file = Core::File::construct(path);
     if (!m_file->open(Core::IODevice::ReadWrite)) {
-        m_error_string = String::format("Can't open file: %s", m_file->error_string());
+        m_error_string = String::formatted("Can't open file: {}", m_file->error_string());
         return;
     }
     m_file->seek(44);