MacOS Big Sur:Fix to resolve Prefer Tabs issue

Fixed.

Got it working with an exec call.

Posted https://stackoverflow.com/questions/66367572/on-macos-can-i-add-a-default-setting-as-part-of-my-info-plist-file-for-my-java-a

Better workaround is defaults write com.jthink.songkong "AppleWindowTabbingMode" manual but can we implement this in the build or does user have to do this manually.

The Pref tabs setting can mess up the Fix Songs progress window making it full screen.