Toggling infer no longer toggles explanations

[jamesreprise]

What is the goal of this PR?

When we run a query, we automatically include TypeDBOptions given the state of the toolbar. Currently, we derive the value of explain for TypeDBOptions from infer. We should derive it from explain.

What are the changes implemented in this PR?

We only turn on explanations when explain is on, not when infer is on.

[grabl]

PR Review Checklist

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[jamesreprise]

Moving this back to draft to create a regression test.