Bump superdesk-core from a7e270d to ec7dba0 in /client (#168)

Bumps [superdesk-core](https://github.com/superdesk/superdesk-client-core) from `a7e270d` to `ec7dba0`.
- [Release notes](https://github.com/superdesk/superdesk-client-core/releases)
- [Commits](superdesk/superdesk-client-core@a7e270d...ec7dba0)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>