Fix reduced animation mode not working inside mutation form

[MetRonnie]

Closes https://github.com/cylc/cylc-ui/issues/1989

Workaround for https://github.com/vuetifyjs/vuetify/issues/18123

Check List

• [x] I have read CONTRIBUTING.md and added my name as a Code Contributor.
• [x] Contains logically grouped changes (else tidy your branch by rebase).
• [x] Does not contain off-topic changes (use other PRs for other changes).
• [x] Tests not needed as this is an external bug
• [x] Changelog entry not included as minor
• [x] No docs needed