Use setData for model fetches as well as collection fetches.

[rtibbles]

Summary

Description of the change(s) you made

• Rectifies a massive oversight whereby only collection fetches had local changes applied to them
• Uses the same setData logic as used in fetchCollection when we fetch a model that is stored in indexedDB

Manual verification steps performed

Follow the steps in Part 2 of #2888 (comment)

This is most easily done by increasing the sync interval in serverSync.js to something huge.

References

Fixes #2888
Fixes #3018

Comments

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[bjester]

Verified fixed the issues

[pcenov]

Tested at hotfixes.studio.learningequality.org - didn't stumble upon any issues with the channel details.