core/sync: Stop logging already synced seq
core/sync: Stop logging already synced seq

It always happens, it's normal, and generates a lot of noise in logs.
We still need to figure out a way to prevent infinite loops though.

cozy-labs/cozy-desktop,nono/cozy-desktop,nono/cozy-desktop,cozy-labs/cozy-desktop,nono/cozy-desktop,nono/cozy-desktop,cozy-labs/cozy-desktop,cozy-labs/cozy-desktop