[CODEOWNERS] Remove romoore@ (#9660)
[CODEOWNERS] Remove romoore@ (#9660)

Removes romoore@ as a codeowner since he is no longer on the Core team.
material-components/material-components-ios,material-components/material-components-ios,material-components/material-components-ios,material-components/material-components-ios,material-components/material-components-ios