Fix tabs render order in nested schema with ui-schema

[Ayush1959]

When we create a nested schema that employs a widget multiple times (not needed to give the same one multiple times) and provide a UI order for the inner schema, the tabs become disrupted. They revert to using the default JSON order, and during rendering, the tabs may be pushed down to the second or third row, depending on the first key. You can see a live preview of this issue in action by visiting this link: https://codesandbox.io/s/rsjf-widget-with-body-9gh2x6?file=/src/App.js