Update icons in about:debugging page

[Aleksandra0056]

Is your feature request related to a problem?

Icons in about:debugging page weren't updated on the release of Proton re-design (Firefox v89.0.0), but I think, that they should be updated.

Setup panel item icon:

Network location table icon:

Old extensions puzzle icons:

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Ditto, but corresponding SVGs:

Setup panel item icon:

Network location table icon:

Old extensions puzzle icon:

The solution I'd like

Replace old icons with new icons:

For setup panel item:

For network location table:

For old extension puzzle icons:

Screenshots or video

No response

Alternatives I've considered

No response

Additional context

No response