Fix anonymous activity finding

Trying to find an anonymously created activity resulted in failure.
It happened because the activity comparison compared both the activity
name and the creator's name.

Fixed by comparing only the activity names in the anonymous creator case.

Fixes GF-6610.

Open-webOS-DCO-1.0-Signed-off-by: Teppo Pennanen <teppo.pennanen@lge.com>

Change-Id: Ic5ba6174b4cea944234cefd9acedb1dc6d0e39c4