DYN-5656 Preferences Blocking Action Bug

[RobertGlobant20]

Purpose

Fixing bug reported when closing the Preferences panel was still showing the dark background.
If we open the PackageManager from Preferences panel and then back to Preferences panel using the link then after closing preferences the background was still present. So with this fix is removing the background under the described specfic case.

Declarations

Check these if you believe they are true

• The codebase is in a better state after this PR
• Is documented according to the standards
• The level of testing this PR includes is appropriate
• User facing strings, if any, are extracted into *.resx files
• All tests pass using the self-service CI.
• Snapshot of UI changes, if any.
• Changes to the API follow Semantic Versioning and are documented in the API Changes document.
• This PR modifies some build requirements and the readme is updated
• This PR contains no files larger than 50 MB

Release Notes

Fixing bug when closing the Preferences panel was still showing the dark background following a specifc flow.

Reviewers

@QilongTang

FYIs

@avidit

[RobertGlobant20]

GIF showing the expected behavior under a specfic windows flow.

[github-actions]

UI Smoke Tests

Test: success. 2 passed, 0 failed.
TestComplete Test Result
Workflow Run: UI Smoke Tests
Check: UI Smoke Tests - net8.0

[QilongTang]

LGTM

[QilongTang]

Passing at https://master-5.jenkins.autodesk.com/job/Dynamo/job/DynamoSelfServe/job/pullRequestValidation/13700/