Fix guided tour crash

[reddyashish]

Purpose

Fixes the crash in here : https://jira.autodesk.com/browse/DYN-5056

When a home workspace is closed, we will close the file trust dialog if it is open. This will prevent the guided tour crash and also enables the user to just close the workspace using the close button.

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

Release Notes

(FILL ME IN) Brief description of the fix / enhancement. Mandatory section

Reviewers

@QilongTang @zeusongit

[QilongTang]

LGTM, can we add a unit test somehow?

[reddyashish]

Added a UI test.

[reddyashish]

CI passed: https://master-5.jenkins.autodesk.com/job/Dynamo/job/DynamoSelfServe/job/pullRequestValidation/6412/