maybe fix conv.backward for joint graph export

[pianpwk]

Differential Revision: D62910149

[pytorch-bot]

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❌ 3 New Failures

As of commit af85ad1 with merge base b14dea8 ():

NEW FAILURES - The following jobs have failed:

• Lint / lintrunner / linux-job (gh)
  >>> Lint for exir/tests/test_joint_graph.py:
• pull / unittest / linux / linux-job (gh)
  exir/tests/test_joint_graph.py::TestJointGraph::test_conv
• pull / unittest / macos / macos-job (gh)
  exir/tests/test_joint_graph.py::TestJointGraph::test_conv

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This pull request was exported from Phabricator. Differential Revision: D62910149

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Looks like this PR hasn't been updated in a while so we're going to go ahead and mark this as Stale.
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