app.getAppByOwner: Use the slug for filtering
app.getAppByOwner: Use the slug for filtering

Change-type: minor
Depends-on: https://github.com/resin-io/resin-api/pull/1570
Signed-off-by: Thodoris Greasidis <5791bdc4541e79bd43d586e3c3eff1e39c16665f@balena.io>
resin-io/resin-sdk