Fixed Issue #1172: Discard button now reverts textValue.text to original string value

[KrisRJack]

Fixes #1172

Fixed issue that prevented Discard observer from undoing changes.

Testing and Review Notes

Open app and edit a Login Record. Change the Username field or Password field. Click Cancel and discard changes. Changes should no longer be viewable.

To Do

• add “WIP” to the PR title if pushing up but not complete nor ready for review
• double check the original issue to confirm it is fully satisfied
• add testing notes and screenshots in PR description to help guide reviewers
• add unit tests
  • optional: consider adding integration tests (UI specs)
• consider running this branch in the simulator and check for warnings
• request the "UX" team perform a design review (if/when applicable)
• make sure CI builds are passing (e.g.: fix lint and other errors)