[MV] Update instance state as frame idx callback

[roomrys]

Description

We are leaving behind the selected "instance" state even when we switch frame indices. The "instance" state is meant to represent the currently selected Instance. This causes some unexpected behavior especially noticeable on the multiview branch where we use state["instance"] to determine which InstanceGroup(s) in the current FrameGroup to triangulate.

Thus, this PR adds a callback to state["frame_idx"] to also set state["instance"] = None.

Types of changes

• Bugfix
• New feature
• Refactor / Code style update (no logical changes)
• Build / CI changes
• Documentation Update
• Other (explain)

Does this address any currently open issues?

• Set selected instance to None when switching videos/frames #1988

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.18%. Comparing base (62035aa) to head (d3b976b).
Report is 1 commits behind head on liezl/add-gui-elements-for-sessions.

Additional details and impacted files

@@                           Coverage Diff                           @@
##           liezl/add-gui-elements-for-sessions    #2012      +/-   ##
=======================================================================
- Coverage                                74.18%   74.18%   -0.01%     
=======================================================================
  Files                                      135      135              
  Lines                                    25441    25444       +3     
=======================================================================
+ Hits                                     18874    18875       +1     
- Misses                                    6567     6569       +2     

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