Sync runs `chown` on `sync_folders` causing every file inside to be touched

[fearenales]

When a system is restarted, sync is refreshed and this line is run, causing every file inside sync_folders to be touched.

In Azkfiles with multiple systems and a watcher build (e.g. ember, gulp), this causes ALL systems to build everytime a system is restarted.

cc @alexferreira