[XB] Thread Mark Read 2.0.0 Patch Level 2

XF 2.3 support

This product is now only available with a paid support membership.
With this upgrade, you get access to the entire full collection of add-ons of the corresponding tier until its expiry date.

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Changelog:

• Fix: button is not visible on some custom styles
• Fix: Don't allow toggle read for thread that will always be seen as read ("Read marking data lifetime" option)