Bring back multicol reftests that got DRTified for impl-side painting.

LayoutTests/platform/mac/fast/multicol/layers-in-multicol-expected.txt

Index: LayoutTests/platform/mac/fast/multicol/layers-in-multicol-expected.txt
diff --git a/LayoutTests/platform/mac/fast/multicol/layers-in-multicol-expected.txt b/LayoutTests/platform/mac/fast/multicol/layers-in-multicol-expected.txt
deleted file mode 100644
index e74583be7b72dd29bab82f9f6034d234a83d6786..0000000000000000000000000000000000000000
--- a/LayoutTests/platform/mac/fast/multicol/layers-in-multicol-expected.txt
+++ /dev/null
@@ -1,111 +0,0 @@
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