Prevent faces bleeding through into magit-blame overlays

Nicolas De Jaeghere requested to merge Koekelas/modus-themes:magit-blame into main

7d30067e made me remember a commitment I made. Similar in spirit to !27 (merged) (faces bleeding through into overlays), but for magit-blame. Notice how the blame overlays are no longer slanted when the line the overlay is for is slanted (old left, new right):


Edited by Nicolas De Jaeghere

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