Remove redundant nvml::Shutdown from optical flow

[JanuszL]

• Fix inconsistent calls to nvml::Init and nvml::Shutdown #5317 moved to scop based
  nvml init and shutdown, but a redundant shutdown has been
  left in the optical flow destructor. This PR removes it.

Category:

Bug fix (non-breaking change which fixes an issue)

Description:

• Fix inconsistent calls to nvml::Init and nvml::Shutdown #5317 moved to scop based
  nvml init and shutdown, but a redundant shutdown has been
  left in the optical flow destructor. This PR removes it.

Additional information:

Affected modules and functionalities:

• optical flow

Key points relevant for the review:

• NA

Tests:

• Existing tests apply
  • test_dali_variable_batch_size.test_optical_flow
• New tests added
  • Python tests
  • GTests
  • Benchmark
  • Other
• N/A

Checklist

Documentation

• Existing documentation applies
• Documentation updated
  • Docstring
  • Doxygen
  • RST
  • Jupyter
  • Other
• N/A

DALI team only

Requirements

• Implements new requirements
• Affects existing requirements
• N/A

REQ IDs: N/A

JIRA TASK: N/A

[JanuszL]

!build

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[JanuszL]

!build

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CI MESSAGE: [23427363]: BUILD STARTED

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