fix(matchexpr): fix bug in evaluator List view (backport #1278)

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Fixes: #1277

Description of the change:

The root of the bug is that the object passed in to the entity details view is the Target object itself, whereas it should be the Discovery TargetNode which contains the Target as a property.

How to manually test:

1. Run CRYOSTAT_IMAGE=quay.io... sh smoketest.sh...
2. ...

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   This is an automatic backport of pull request #1278 done by Mergify.

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