fix(tests): enable ONNX backend test case for Celu operator

wonnx-py/tests/test_onnx_backend.py

@@ -144,17 +144,14 @@ def do_enforce_test_coverage_safelist(model):  # type: (ModelProto) -> bool
 backend_test.include(f"test_reciprocal_[a-z,_]*")
 backend_test.include(f"test_shape_[a-z,_]*")
 backend_test.include(f"test_size_[a-z,_]*")
+backend_test.include(f"test_celu_[a-z,_]*")
 
 # For these we only test the default version, as we don't support the bool type
 backend_test.include(f"test_prelu_broadcast_cpu$")
 backend_test.include(f"test_elu_cpu$")
 backend_test.include(f"test_relu_cpu$")
 backend_test.include(f"test_leakyrelu_default_cpu$")
 
-
-# Fails due to tolerance issues?
-# backend_test.include(f"test_celu_cpu$")
-
 # Don't support 'bool' type
 # backend_test.include(f"test_and_bcast[a-z0-9,_]*")
 # backend_test.include(f"test_or_bcast[a-z0-9,_]*")