FIO-10052: fix old conditional formats for select boxes

[yauheni-formio]

Link to Jira Ticket

https://formio.atlassian.net/browse/FIO-10052

Description

I added ".?" in regex because without it select box works only inside of other components (container, etc.).
Now it works even if select box is root component in form.

Breaking Changes / Backwards Compatibility

n/a

How has this PR been tested?

I added a test

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