[BugFix] Use traj_terminated in SliceSampler

[Cadene]

Description

"terminated" tensor was not properly populated in SliceSampler.

Motivation and Context

Addresses this bug report: #1877

• I have raised an issue to propose this change (required for new features and bug fixes)

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds core functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation (update in the documentation)
• Example (update in the folder of examples)

Checklist

• I have read the CONTRIBUTION guide (required)
• My change requires a change to the documentation.
• I have updated the tests accordingly (required for a bug fix or a new feature).
• I have updated the documentation accordingly.

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/rl/1884

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✅ You can merge normally! (4 Unrelated Failures)

As of commit 2d92eab with merge base 144f547 ():

FLAKY - The following jobs failed but were likely due to flakiness present on trunk:

• Continuous Benchmark (PR) / CPU Pytest benchmark (gh)
  Workflow failed! Resource not accessible by integration
• Continuous Benchmark (PR) / GPU Pytest benchmark (gh)
  Workflow failed! Resource not accessible by integration
• Habitat Tests on Linux / tests (3.9, 11.6) / linux-job (gh)
  RuntimeError: Command docker exec -t b39ca5294fbbe960aaba2b5c9a158bc8dbb66d3e1f9421b8a76fa8ce7f43b262 /exec failed with exit code 139
• Unit-tests on Windows / unittests-gpu / windows-job (gh)
  File was unable to be removed Error: EBUSY: resource busy or locked, unlink 'C:\actions-runner\_work\rl\rl\pytorch\rl\env\Scripts\pytest.exe'

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[vmoens]

LGTM thanks!