[AdamW] Fix complex x amsgrad support

[janeyx99]

Stack from ghstack (oldest at bottom):

• -> [AdamW] Fix complex x amsgrad support #104990
• [Adam] Fix complex x amsgrad support #104989

[pytorch-bot]

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✅ 3 Unrelated Failures

As of commit 3162cbc:

UNSTABLE - The following jobs failed but were likely due to flakiness present on trunk and has been marked as unstable:

• linux-bionic-cuda11.8-py3.10-gcc9 / test (distributed, 3, 3, linux.8xlarge.nvidia.gpu, unstable) (gh)
• linux-focal-py3.8-gcc7 / test (distributed, 1, 2, linux.2xlarge, unstable) (gh)
• linux-focal-rocm5.6-py3.8 / test (default, 2, 3, linux.rocm.gpu, unstable) (gh)

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[albanD]

Ho good catch, thanks!

[janeyx99]

@pytorchbot merge

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