Fix multi PCD groups in the modal

[benjaminpkane]

Fixes non-default pcd slice rendering in the modal

import fiftyone.zoo as foz

dataset = foz.load_zoo_dataset("quickstart-groups", max_samples=3)
dataset.persistent = True
dataset.group_slice = "pcd"
extra = dataset.first().copy()
extra.group.name = "extra"
dataset.add_sample(extra)

Before

Screen.Recording.2024-01-25.at.4.38.51.PM.mov

After

Screen.Recording.2024-01-25.at.4.38.02.PM.mov

[codecov]

Codecov Report

Attention: 11 lines in your changes are missing coverage. Please review.

Comparison is base (328eb76) 15.98% compared to head (463a3f8) 15.98%.

Files	Patch %	Lines
...ackages/looker-3d/src/action-bar/SliceSelector.tsx	0.00%	5 Missing ⚠️
.../src/components/Sidebar/Entries/PathValueEntry.tsx	0.00%	3 Missing ⚠️
app/packages/state/src/recoil/groups.ts	0.00%	3 Missing ⚠️

Additional details and impacted files

@@                 Coverage Diff                 @@
##           release/v0.23.5    #4044      +/-   ##
===================================================
- Coverage            15.98%   15.98%   -0.01%     
===================================================
  Files                  732      732              
  Lines                81966    81971       +5     
  Branches              1101     1101              
===================================================
  Hits                 13100    13100              
- Misses               68866    68871       +5     

Flag	Coverage Δ
app	15.98% <0.00%> (-0.01%)	⬇️

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[sashankaryal]

👏 for adding tests too