Fix notification email for image diff notes
What are the relevant issue numbers?
Fixes https://sentry.gitlab.net/gitlab/gitlabcom/issues/590898/. Related to https://gitlab.com/gitlab-org/gitlab-ce/issues/53678.
Does this MR meet the acceptance criteria?
-
Changelog entry added, if necessary -
Tests added for this feature/bug -
Conforms to the code review guidelines
Edited by Douwe Maan