[FF] Fix WebManifest Orientation 1.0.0

xF 2.2.13 brings in a bug where your phones auto-orientation settings are ignored and the app will rotate even if you have orientation locked.

This add-on fixes that.

Two things you'll then need to do:

1. Open YOURSITEURL/webmanifest.php in your browser on your phone, then refresh the page (this will make sure you don't have a cached manifest)
2. Remove and then re-add your app from the home screen (this might not actually be necessary if it picks up the new manifest from...

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