Fix slice change when filters are present

[benjaminpkane]

What changes are proposed in this pull request?

Fixes changing the group grid slice when a filter is present. Optional chaining was missing. See recording

Before

Screen.Recording.2024-02-21.at.11.30.39.AM.mov

After

Screen.Recording.2024-02-21.at.11.30.20.AM.mov

How is this patch tested? If it is not, please explain why.

Locally

Release Notes

• Fixed changing group slice in the grid when a sidebar filter is present

What areas of FiftyOne does this PR affect?

• App: FiftyOne application changes
• Build: Build and test infrastructure changes
• Core: Core fiftyone Python library changes
• Documentation: FiftyOne documentation changes
• Other

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (6086bf2) 15.99% compared to head (801581c) 15.99%.
Report is 6 commits behind head on release/v0.23.6.

Files	Patch %	Lines
.../core/src/components/Filters/StringFilter/state.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@               Coverage Diff                @@
##           release/v0.23.6    #4098   +/-   ##
================================================
  Coverage            15.99%   15.99%           
================================================
  Files                  732      732           
  Lines                82062    82062           
  Branches              1110     1110           
================================================
  Hits                 13123    13123           
  Misses               68939    68939           

Flag	Coverage Δ
app	15.99% <0.00%> (ø)

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[brimoor]

LGTM (static review based on attached screenshots)