[BugFix] Fix tanh normal mode

[vmoens]

Solves #2186, please post comments about the feature in that discussion.

Related PR: pytorch/tensordict#824

cc @matteobettini

[pytorch-bot]

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/rl/2198

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❌ 10 New Failures, 3 Unrelated Failures

As of commit f1b6aad with merge base 1d729e8 ():

NEW FAILURES - The following jobs have failed:

• Continuous Benchmark (PR) / CPU Pytest benchmark (gh)
  Process completed with exit code 1.
• Continuous Benchmark (PR) / GPU Pytest benchmark (gh)
  Workflow failed! Cannot read properties of undefined (reading 'ops')
• Habitat Tests on Linux / tests (3.9, 12.1) / linux-job (gh)
  RuntimeError: Command docker exec -t e9312a637f83b23ccb5062f1a520b43a229c26ebd6f9fdf6ab1bba8ada72be9d /exec failed with exit code 139
• Unit-tests on Linux / tests-cpu (3.10) / linux-job (gh)
  test/test_tensordictmodules.py::TestGRUModule::test_gru_parallel_env[False-False-False]
• Unit-tests on Linux / tests-cpu (3.11) / linux-job (gh)
  test/test_tensordictmodules.py::TestGRUModule::test_gru_parallel_env[False-False-False]
• Unit-tests on Linux / tests-cpu (3.8) / linux-job (gh)
  test/test_tensordictmodules.py::TestGRUModule::test_gru_parallel_env[False-False-False]
• Unit-tests on Linux / tests-cpu (3.9) / linux-job (gh)
  test/test_tensordictmodules.py::TestGRUModule::test_gru_parallel_env[False-False-False]
• Unit-tests on Linux / tests-gpu (3.10, 12.1) / linux-job (gh)
  test/test_transforms.py::TestBatchSizeTransform::test_transform_rb[TensorDictReplayBuffer-False-reshape]
• Unit-tests on Linux / tests-optdeps (3.10, 12.1) / linux-job (gh)
  RuntimeError: Command docker exec -t 9aaa6344a6f5ec0f26790ff1a84ca7ab038fd09930ef4e94c064a864f9ce7207 /exec failed with exit code 250
• Unit-tests on Linux / tests-stable-gpu (3.10, 11.8) / linux-job (gh)
  test/test_transforms.py::TestBatchSizeTransform::test_transform_rb[TensorDictReplayBuffer-False-reshape]

FLAKY - The following job failed but was likely due to flakiness present on trunk:

• Unit-tests on Windows / unittests-cpu / windows-job (gh) (detected as infra flaky with no runner)

BROKEN TRUNK - The following jobs failed but was present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• Libs Tests on Linux / unittests-gym (3.9, 12.1) / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• Unit-tests on Linux / tests-olddeps (3.8, 11.6) / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.

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