Review is not invalidated after a conflict is fixed

Any changed performed on the content of a change request should invalidate the approval reviews. Right now fixing a conflict does not invalidate a review.

Reproduction steps:

• Create two change requests on same page same lines
• Merge one of them
• Add an approval review on the change request with a conflict
• Fix the conflict

Expected result:

• the approval review is now outdated

Obtained result:

• the approval review is still valid