Move old multicol tests to a separate directory.

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

Index: LayoutTests/platform/mac/fast/multicol/vertical-lr/nested-columns-expected.txt
diff --git a/LayoutTests/platform/mac/fast/multicol/vertical-lr/nested-columns-expected.txt b/LayoutTests/platform/mac/fast/multicol/vertical-lr/nested-columns-expected.txt
deleted file mode 100644
index 21e860c633098791e7e6af14c363a78da8717295..0000000000000000000000000000000000000000
--- a/LayoutTests/platform/mac/fast/multicol/vertical-lr/nested-columns-expected.txt
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