Jukebox cleanup

[ms140569]

This PR fixes a bug and a typo and aligns the configuration file syntax with mpv's audio device syntax.

Here's an example:

# Enable/Disable Jukebox mode
Jukebox.Enabled = true

# List of registered devices, syntax:
#  "symbolic name " - Symbolic name to be used in UI's
#  "device" - mpv audio device name, do mpv --audio-device=help to get a list

Jukebox.Devices = [
    # "symbolic name " "device"
    [ "internal",     "coreaudio/BuiltInSpeakerDevice" ],
    [ "dac",          "coreaudio/AppleUSBAudioEngine:Cambridge Audio :Cambridge Audio USB Audio 1.0:0000:1" ]
]

# Device to use for Jukebox mode, if there are multiple entries above.
# Using device "auto" if missing
Jukebox.Default = "dac"

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Download the artifacts for this pull request:

• binaries.zip
• js-bundle.zip

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