Adjust 'test_quantize_op_fusion_pass' test to account for SHIFT_INT8 value (2^20)

[psiddh]

Summary: The test should expect -18 because that's the mathematically correct result when you include the ÷ 2^20 (SHIFT_INT8) factor that ARM chips need for their quantization.

Reviewed By: GregoryComer

Differential Revision: D85986326

[pytorch-bot]

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❌ 1 New Failure

As of commit 4f78ccd with merge base bbc0967 ():

NEW FAILURE - The following job has failed:

• pull / unittest-arm-backend-with-no-fvp (test_pytest_ops) / linux-job (gh)
  RuntimeError: Command docker exec -t 78fc549915db43db3d88371ea64322e0b13ad26c0812698814898ce45edbf10a /exec failed with exit code 1

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[meta-codesync]

@psiddh has exported this pull request. If you are a Meta employee, you can view the originating Diff in D85986326.

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