update all trackers progress when new tracker is added

[cuong-tran]

Whenever a new tracker is add, it will try to sync all trackers together with local reading progress

[AntsyLich]

what's the reasoning?

[cuong-tran]

for example, if user has 2 trackers but with different progress, when user adds the 2nd tracker with a higher progress, this will sync all trackers to that higher progress instead of waiting for the next sync.

Also, there is the TODO put right there state that.