Bump superdesk-core from ab2db3b to faa591f in /client (#571)

Bumps [superdesk-core](https://github.com/superdesk/superdesk-client-core) from `ab2db3b` to `faa591f`.
- [Release notes](https://github.com/superdesk/superdesk-client-core/releases)
- [Commits](superdesk/superdesk-client-core@ab2db3b...faa591f)

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

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