do not delete objectIds when sync is reset

[diracdeltas]

save the original seed for bookmarks, so they can be synced to a profile with
a different seed if needed. fix #7405.

• Submitted a ticket for my issue if one did not already exist.
• Used Github auto-closing keywords in the commit message.
• Added/updated tests for this change (for new code or code which already has tests).
• Ran git rebase -i to squash commits (if needed).

Test Plan:

1. create a bookmark and a bookmark folder in pyramid 0 and enable sync.
2. sync pyramid 1 to pyramid 0. wait for the bookmark and folder to appear.
3. reset sync in pyramid 1
4. re-sync pyramid 1 to pyramid 0
5. in pyramid 1, move the bookmark into the folder. this change should sync correctly to pyramid 0.
6. reset sync again in pyramid 1
7. delete pyramid 0 completely
8. choose 'i am new to sync' in pyramid 1
9. start pyramid 0. it should have no bookmarks. sync it to pyramid 1's new profile
10. the bookmarks from pyramid 1 should appear in pyramid 0

[ayumi]

success. that was a difficult test plan.

[srirambv]

@diracdeltas Steps 1-5 not working on clean profiles for 0.14.0 Preview 1

[ayumi]

@srirambv 1–5 worked for me, MacOS, master @ 131fce7

[diracdeltas]

1-5 also worked for me on master, once i fixed the issue that was causing the sync server to not work for me at all.

[luixxiul]

the step 5 (in pyramid 1, move the bookmark into the folder. this change should sync correctly to pyramid 0) does not work between Windows 10 32 bit and macOS.

The sync itself is working between them, since another bookmark was synced successfully after moving the bookmark into the folder, which was not synced.

[srirambv]

All steps work fine on Windows(Pyramid 1) and Linux(Pyramid 0).