FIO-10263: rely on instance level evaluation context to provide us with submission variable

[brendanbond]

Link to Jira Ticket

https://formio.atlassian.net/browse/FIO-10263

Description

When we validate on the renderer, we don't provide a submission value into the context. This is a problem, because evaluation contexts need the submission variable as part of the stuff we provide the form user. However, when I made updates to the Evaluator, I accidentally added a submission "overwrite" to the evaluation context instead of just relying on what we get from the instance itself. This PR fixes the error.

Breaking Changes / Backwards Compatibility

n/a

Dependencies

n/a

How has this PR been tested?

Tests for this really belong in formio.js - I will add some and link them here.

Checklist:

• I have completed the above PR template
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation (if applicable)
• My changes generate no new warnings
• My changes include tests that prove my fix is effective (or that my feature works as intended)
• New and existing unit/integration tests pass locally with my changes
• Any dependent changes have corresponding PRs that are listed above