getDetails in syncactiviyhelper.js repaired.

changes in activitymanager break getDetails call

Another, probably more backward compatible solution, would be to make
internal and current flags optional in activitymanager.

Anyway the two extra parameters won't hurt here and in this
configuration the activity should look like before the two flags
existed.

Open-webOS-DCO-1.0-Signed-off-by: Achim Königs <achim@tratschtante.de>