MycroftOS: Small changes to default /etc/mycroft/mycroft.conf

- Log level back to DEBUG, will be INFO at release
- Don't mute the microphone when playing

buildroot-external/rootfs-overlay/etc/mycroft/mycroft.conf

@@ -2,6 +2,9 @@
    "play_wav_cmdline": "aplay -Dhw:0,0 %1",
    "play_mp3_cmdline": "mpg123 -a hw:0,0 %1",
    "ipc_path": "/ramdisk/mycroft/ipc/",
+   "listener": {
+      "mute_during_output": false
+   },
    "ignore_logs": ["enclosure.mouth.viseme", "enclosure.mouth.display"],
-   "log_level": "INFO"
+   "log_level": "DEBUG"
 }