Delete referring-expression-grounding

referring-expression-grounding/test-00000-of-00003.parquet

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-version https://git-lfs.github.com/spec/v1
-oid sha256:7a9a1bab8f2caebedeeef83b652761c34d3a641a2565a26edd0e872a6d76cc7b
-size 412237438

referring-expression-grounding/test-00001-of-00003.parquet

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-version https://git-lfs.github.com/spec/v1
-oid sha256:65f5da4c75aa7f14ad480c68db8326e3e3005d616b60d902f3bca3dea42bdb3e
-size 347145162

referring-expression-grounding/test-00002-of-00003.parquet

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:2dc8514125cc1835a9f3c896462cff6bac119a1c82ac5e29d7981246c1520bb8
-size 100922312

referring-expression-grounding/val-00000-of-00001.parquet

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:be57ac90f2d3a8b7cf6f57b2a23816385a6e457b9008fde7dbc831a23df379d8
-size 117685531