[lensoverlay] Switch from old search icon to new cr23 refresh version.

This icon is only used in non-branded builds but it's a) not the right icon to use post-cr23 launch and b) has an unusually large default size that looks weird in the context menu and find in page dialog (see screenshots). In the other surfaces, the change is subtle since they specify an explicit size so the default size is not an issue.

Before: https://screenshot.googleplex.com/WcQrvabFiodriK6.png
After: https://screenshot.googleplex.com/7wNYvrTHdps6oZy.png

Bug: 346407423
Change-Id: I6688a2e16530f3cc752e5588a75e1c77f0a20cd5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5747352
Code-Coverage: findit-for-me@appspot.gserviceaccount.com <findit-for-me@appspot.gserviceaccount.com>
Reviewed-by: Erik Chen <erikchen@chromium.org>
Commit-Queue: Justin Donnelly <jdonnelly@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1334954}