Implement IceWorkingCopyPatcherVisitor>>visitExtensionDefinition: #1793
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Fixes error trying to revert all extension-method changes in a class, i.e. right-click on the class extension "definition" node and choose revert. Extension definitions are just a container and have no content of their own, so the same implementation as #visitDirectoryDefinition:--just visit the children--seems reasonable.
This fixes pharo-project/pharo#14395—when I reported it I didn't realize Iceberg had its own repo...