Remove unused matching-comparator.rkt file (#723)

Co-authored-by: copilot-swe-agent[bot] <[email protected]>
Co-authored-by: jackfirth <[email protected]>

Author: Copilot

private/matching-comparator.rkt

@@ -49,7 +49,6 @@
          racket/vector
          rebellion/base/comparator
          rebellion/type/singleton
-         resyntax/private/matching-comparator
          syntax/parse/define)