Entire state object passed instead of piece of state

[krfong916]

bottomline/proof-of-concepts/features/stories/combobox/hooks/combobox/utils.ts

Line 173 in c7fab08

props[stateChangeCallback]({ changes: newState });

Observed: onStateChange handlers receive the entire object
Expected: we should only pass the smallest piece of state - the state that changed
Solution: Change object. We also haven't written tests! We need to to fix this issue!