Richtext indent controls missing icons

[ishaisagi-hns]

Category

[ ] Enhancement

[X ] Bug

[ ] Question

Version

Please specify what version of the library you are using: [ 3.22.0 ]

Expected / Desired Behavior / Question

The icons for increase\decrease indent should load

Observed Behavior

Both these icons (in the style pane) are showing as a box (missing)
IncreaseIndentLegacy
DecreaseIndentLegacy

Steps to Reproduce

Author some text in the webpart and highlight it. Then click the ellipsis in the style ribbon to open the style pane.

[github-actions]

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