Bump superdesk-core from ff3da34 to 676be23 in /client (#499)

Bumps [superdesk-core](https://github.com/superdesk/superdesk-client-core) from `ff3da34` to `676be23`.
- [Release notes](https://github.com/superdesk/superdesk-client-core/releases)
- [Commits](superdesk/superdesk-client-core@ff3da34...676be23)

---
updated-dependencies:
- dependency-name: superdesk-core
  dependency-type: direct:production
...

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