Move AudioWidget import to openAudio method to avoid unnecessary soun…

…ddevice installation

annolid/gui/app.py

@@ -52,7 +52,6 @@
 from annolid.postprocessing.glitter import tracks2nix
 from annolid.postprocessing.quality_control import TracksResults
 from annolid.gui.widgets import ProgressingWindow
-from annolid.gui.widgets.audio import AudioWidget
 import webbrowser
 import atexit
 import qimage2ndarray
@@ -688,6 +687,7 @@ def about_annolid_and_system_info(self):
         about_annolid_dialog.exec_()
 
     def openAudio(self):
+        from annolid.gui.widgets.audio import AudioWidget
         if self.video_file:
             self.audio_widget = AudioWidget(self.video_file)
             self.audio_dock = QtWidgets.QDockWidget(self.tr("Audio"), self)