[dynamic modules] Fix dynamic interface for dynamic_modules_suite/override_extra_params test

Fixes #60456

Change-Id: Id59dd0f82959ccefe35f6430b9d3548540d2824f
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/419900
Commit-Queue: Nate Biggs <[email protected]>
Auto-Submit: Alexander Markov <[email protected]>
Reviewed-by: Nate Biggs <[email protected]>

Author: alexmarkov

pkg/dynamic_modules/test/data/override_extra_params/dynamic_interface.yaml

@@ -35,4 +35,3 @@ callable:
     class: 'num'
   - library: 'dart:core'
     class: 'String'
-    member: 'get:length'