Fix: Cancelled Slot not available for booking

[hariombalhara]

What does this PR do?

Fixes # (issue)
Fixes the issue where the cancelled Slot was not available for booking. This is as reported over twist and I am able to replicate it.

Will be updating the cancellation test to do a booking again because that is what's the definition of cancellation.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How should this be tested?

• Test A
• Test B

Checklist

• I haven't added tests that prove my fix is effective or that my feature works
• I haven't checked if new and existing unit tests pass locally with my changes

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[joeauyeung]

The changes make sense to me. Good thinking!

[pumfleet]

Code looks good to me

[zomars]

Wow, big miss from us. Thanks @hariombalhara