Fix deck state transitions. Add test cases for deck state reducer.

[carloskelly13]

Description

• Fixes transition animations not happening when a deck is controlled by a presenter mode view
• Adds test coverage for deck state reducer and util functions

https://github.com/FormidableLabs/spectacle/assets/1738349/5b982569-3f6f-4ff7-992a-d86c51b8afaa

Fixes #1287

Type of Change

• [x] 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 Has This Been Tested?

Run pnpm run start:ts and have a presenter mode (Cmd + K) and regular window open and verify transitions happen in the regular view.

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