CV2-5050 readd target_field value from broken case for text

[DGaffney]

Description

Right now we have a lingering issue where relationships are being persisted without target_field - the root of the error is that for text, the field is wrapped inside the context parameter (and in fact... may always be there?). Quick fix to address that.

References: CV2-5050

How has this been tested?

Tested locally against cached data persisted on Bot::Alegre.process_alegre_callback(params) and confirmed to work.

Things to pay attention to during code review

None in particular!

Checklist

• I have performed a self-review of my own code
• I have added unit and feature tests, if the PR implements a new feature or otherwise would benefit from additional testing
• I have added regression tests, if the PR fixes a bug
• I have added logging, exception reporting, and custom tracing with any additional information required for debugging
• I considered secure coding practices when writing this code. Any security concerns are noted above.
• I have commented my code in hard-to-understand areas, if any
• I have made needed changes to the README
• My changes generate no new warnings
• If I added a third party module, I included a rationale for doing so and followed our current guidelines

[caiosba]

I like that it's a resilient solution

[codeclimate]

Code Climate has analyzed commit 0b6b41a and detected 0 issues on this pull request.

The test coverage on the diff in this pull request is 100.0% (90% is the threshold).

This pull request will bring the total coverage in the repository to 99.9%.

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