Material UI v5: rename Fab's round variant

Proprietary

Renames the round variant to circular, and its class. Ported from the MUI codemod v5.0.0/fab-variant.

org.openrewrite.react.mui.v5.fab-variant
mod run . --recipe=org.openrewrite.react.mui.v5.fab-variant

Install it once from Recipe actions, then run it on every repository under the current directory. New to the Moderne CLI? Set it up.