fix: exposeUnsetFields when useDefineForClassFields is set

[fjodor-rybakov]

Description

When useDefineForClassFields is true in tsconfig option exposeUnsetFields doesn't work. This pull request make force exposeUnsetFields to remove property from class if finalValue is undefined

Checklist

• the pull request title describes what this PR does (not a vague title like Update index.md)
• the pull request targets the default branch of the repository (develop)
• the code follows the established code style of the repository
  • npm run prettier:check passes
  • npm run lint:check passes
• tests are added for the changes I made (if any source code was modified)
• documentation added or updated
• I have run the project locally and verified that there are no errors