sizegroup: Merge function into only caller
sizegroup: Merge function into only caller

Both functions were running the same loop. Just running the loop once
seems advantageous.

grubersjoe/adwaita,grubersjoe/adwaita,grubersjoe/adwaita,grubersjoe/adwaita,grubersjoe/adwaita,grubersjoe/adwaita,grubersjoe/adwaita,grubersjoe/adwaita