unskip the flat func tests

Author: Alexander-Makaryev

tests/skipped_tests.tbl

@@ -24,9 +24,6 @@ tests/test_dparray.py::test_flatten[[]-int32]
 tests/test_dparray.py::test_flatten[[]-bool]
 tests/test_dparray.py::test_flatten[[]-bool_]
 tests/test_dparray.py::test_flatten[[]-complex]
-tests/test_flat.py::test_flat[int64]
-tests/test_flat.py::test_flat2[int64]
-tests/test_flat.py::test_flat3[int64]
 tests/test_dparray.py::test_astype[[-2, -1, 0, 1, 2]-float64-float64]
 tests/test_dparray.py::test_astype[[-2, -1, 0, 1, 2]-float64-float32]
 tests/test_dparray.py::test_astype[[-2, -1, 0, 1, 2]-float64-int64]