Draft: fix: generate symlinks for 24px versions

Kristen McWilliamrequested to merge
work/merritt/24px-symlinks into master

Need to check the build dir for the symlink source, not the src dir.

Generates 3448 symlinks that were previously being skipped.

Before After
image Screenshot_20250426_133359

Test Plan

  • Launch virt-manager
    • If you have no virtual machines setup you can do so with virt-manager --connect test:///default
    • Note the second icon at the top left "info" is no longer oversized

BUG: 493975

CC @ngraham

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