Fix custom highlight sounds not working on Linux

src/providers/twitch/TwitchChannel.cpp

@@ -13,6 +13,7 @@
 #include "util/PostToThread.hpp"
 
 #include <IrcConnection>
+#include <QJsonArray>
 #include <QThread>
 #include <QTimer>
 

src/providers/twitch/TwitchMessageBuilder.cpp

@@ -440,7 +440,7 @@ void TwitchMessageBuilder::parseHighlights()
     // update the media player url if necessary
     QUrl highlightSoundUrl;
     if (app->settings->customHighlightSound) {
-        highlightSoundUrl = QUrl(app->settings->pathHighlightSound.getValue());
+        highlightSoundUrl = QUrl::fromLocalFile(app->settings->pathHighlightSound.getValue());
     } else {
         highlightSoundUrl = QUrl("qrc:/sounds/ping2.wav");
     }