AudioOutput: Create text to speech in constructor

Signed-off-by: Patrick José Pereira <patrickelectric@gmail.com>

src/Audio/AudioOutput.cc

@@ -18,8 +18,8 @@
 
 AudioOutput::AudioOutput(QGCApplication* app, QGCToolbox* toolbox)
     : QGCTool(app, toolbox)
+    , _tts(new QTextToSpeech(this))
 {
-    _tts = new QTextToSpeech(this);
     connect(_tts, &QTextToSpeech::stateChanged, this, &AudioOutput::_stateChanged);
 }