grid-cell, name-cell: Revert emblem workaround

velsinki requested to merge velsinki/nautilus:revert_emblem_workaround into main

This reverts commit 032d7d00. Since GTK 4.11.2, the workaround in that commit is not needed anymore, as gtk@e20a5e1b fixes the lookup behavior for unthemed icons. See gtk!5865 (merged) for more details. GTK 4.11.2 is the required version already in, so the fix should be included.

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