Delete old duckdb index files

mediasum/test/index.duckdb

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:336d861cd8f2fea2d43d1e73a39843b6386a91f8329fdf06ab84c0fad1337e89
-size 164900864

mediasum/validation/index.duckdb

@@ -1,3 +0,0 @@
-version https://git-lfs.github.com/spec/v1
-oid sha256:29f63555a723e9f2c3bdfd9a41b276013de89b4dd25b5895e99d26e9376f1fa9
-size 161492992