[mlir][sparse] fix broken test (merge conflict marker was left) (llvm#72438)

Author: aartbik

mlir/test/Integration/Dialect/SparseTensor/CPU/sparse_pack.mlir

@@ -17,7 +17,6 @@
 // DEFINE: %{env} =
 //--------------------------------------------------------------------------------------------------
 
-<<<<<<< HEAD
 // RUN: %{compile} | %{run} | FileCheck %s
 //
 // Do the same run, but now with direct IR generation.