[VideoMode] Fix refresh Setup on changedEntry (#3672)

[VideoMode.py] Small corrections and clean up

- Remove 'self.onChangedEntry', 'keyLeft', and 'keyRight' redefinitions of parent class objects.
- Add missing changed event processing for ConfigBoolean and ConfigSelection items.
- Sort imports.
- Add another f-string definition.
- White space and comments clean up.

NOTE: This clean up and corrections is being done in preparation for a complete refactor of this code.  The Setup based screen will become a sub-class of the real Setup screen.

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Co-authored-by: IanSav <6904736+IanSav@users.noreply.github.com>

Author: GhostofGeeeee