Modal fixes

A few fixes related to the thew modal screens, and ordered Markdown lists.

[0.17.2] - 2023-04-02

[Fixed]

• Fixed bindings persistance #1613
• The Markdown widget now auto-increments ordered lists #2002
• Fixed modal bindings #2194
• Fix binding enter to active button #2194

[Changed]

• tab and shift+tab are now defined on Screen.