Move old multicol tests to a separate directory.

LayoutTests/platform/mac/fast/multicol/nested-columns-expected.txt

Index: LayoutTests/platform/mac/fast/multicol/nested-columns-expected.txt
diff --git a/LayoutTests/platform/mac/fast/multicol/nested-columns-expected.txt b/LayoutTests/platform/mac/fast/multicol/nested-columns-expected.txt
deleted file mode 100644
index 52b59733fa6c2587e9c1a2f7df7951d10cd4a273..0000000000000000000000000000000000000000
--- a/LayoutTests/platform/mac/fast/multicol/nested-columns-expected.txt
+++ /dev/null
@@ -1,48 +0,0 @@
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