Describe the bug
Undo does not seem to affect the retained suggestion info.

To Reproduce
Steps to reproduce the behavior:

1. Enable retaining suggestion info in a multi-value string feature
2. Accept two label suggestions (which get added to the multi-value feature)
3. Undo one action
4. See that the suggestion info for the undone action is still retained

Expected behavior
Remove recorded scores on undo (relevant e.g. for multi-feature annotations, multi-value features or when a label is merged into an existing annotation without a label).

Screenshots
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Please complete the following information:

• Version and build ID: [see bottom of the browser screen]
• OS: [e.g. Windows, Linux, OS X]
• Browser: [e.g. chrome, safari]

Additional context
Add any other context about the problem here.