Share toc id between TocChunkerFormatter and SectorTocBlock

Will think about tests over the weekend

Was hoping to make a simple unit test but mocking the field formatter was painful.

Test only changes pipeline shows:

> Failed asserting that actual size 2 matches expected size 1.

Think it is worth adding a proper functional js text to cover everything in this module - but this should be a OK start for this improvement.

Thanks Eric!

Automatically closed - issue fixed for 2 weeks with no activity.