chrome: fix getting default audio device

Setting "audiooutput.audiodevice" was not found any more because
settings format has be changed to version 2.

Read the setting value via Kodi json RPC.

packages/addons/browser/chrome/source/default.py

@@ -7,7 +7,7 @@ import sys
 import time
 import xbmcaddon
 import subprocess
-from xml.dom.minidom import parse
+import json
 
 sys.path.append('/usr/share/kodi/addons/service.libreelec.settings')
 
@@ -59,11 +59,14 @@ def isRuning(pname):
   return False
 
 def getAudioDevice():
-  try:
-    dom = parse("/storage/.kodi/userdata/guisettings.xml")
-    audiooutput=dom.getElementsByTagName('audiooutput')
-    for node in audiooutput:
-      dev = node.getElementsByTagName('audiodevice')[0].childNodes[0].nodeValue
+  dev = json.loads(xbmc.executeJSONRPC(json.dumps({
+                      "jsonrpc": "2.0",
+                      "method": "Settings.GetSettingValue",
+                      "params": {
+                                  "setting": "audiooutput.audiodevice",
+                                },
+                      "id": 1,
+                   })))['result']['value']
   if dev.startswith("ALSA:"):
     dev = dev.split("ALSA:")[1]
     if dev == "@":
@@ -73,8 +76,6 @@ def getAudioDevice():
   else:
     # not ALSA
     return None
-  except:
-    return None
   if dev.startswith("CARD="):
     dev = "plughw:" + dev
   return dev