fix(tree): correctly update dependant checked states

[TremayneChrist]

Description

Correctly updates dependant item chacked states, when managing relationships.

Type of change

• Bug fix (non-breaking change which fixes an issue)

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have checked my code and corrected any misspellings

[dtanp-rft]

LGTM. Hope we can add new test case so we can regression test this in the future.