Vesting Schedule includes vesting events from cancelled grants

[franckc]

Issue description

The front-end logic for the "Vesting Schedule" component does not account properly for grants that have been cancelled at a certain date. It only checks on the vesting event date vis-a-vis the current date. It should also include checking whether the vesting event is invalid because it occurred past the grant's cancellation date.

See code:

t3/token-transfer-client/src/components/VestingHistory.js

Line 41 in dfa1fb0

{momentDate < moment.now() ? 'vested' : 'unvested'}

Impact

• If a user has a grant that was cancelled, they'll still see vesting events as "vested" past the grant cancellation date. This is confusing.
• Note that the total balance displaying on the UI and also the logic for withdrawal are correct - they account properly for grant cancellation. So there is no financial impact.