Minor cleanup of webp decoding mode logic

[NicolasHug]

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[pytorch-bot]

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✅ You can merge normally! (24 Unrelated Failures)

As of commit dbde550 with merge base fd0e28e ():

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

• CMake / linux (linux.12xlarge, cpu) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• CMake / linux (linux.g5.4xlarge.nvidia.gpu, cuda, 11.8) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• CMake / macos (macos-m1-stable) / macos-job (gh) (detected as infra flaky with no log or failing log classifier)
• CMake / windows (windows.4xlarge, cpu) / windows-job (gh) (detected as infra flaky with no log or failing log classifier)
• CMake / windows (windows.g5.4xlarge.nvidia.gpu, cuda, 11.8) / windows-job (gh) (detected as infra flaky with no log or failing log classifier)
• Docs / build / linux-job (gh) (similar failure)
• Lint / c-source / linux-job (gh) (similar failure)
• Lint / python-source-and-configs / linux-job (gh) (similar failure)
• Lint / python-types / linux-job (gh) (similar failure)
• Tests / onnx / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• Tests / unittests-linux (3.10, linux.12xlarge, cpu) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• Tests / unittests-linux (3.11, linux.12xlarge, cpu) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• Tests / unittests-linux (3.12, linux.12xlarge, cpu) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• Tests / unittests-linux (3.9, linux.12xlarge, cpu) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• Tests / unittests-linux (3.9, linux.g5.4xlarge.nvidia.gpu, cuda, 11.8) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• Tests / unittests-macos (3.10, macos-m1-stable) / macos-job (gh) (detected as infra flaky with no log or failing log classifier)
• Tests / unittests-macos (3.11, macos-m1-stable) / macos-job (gh) (detected as infra flaky with no log or failing log classifier)
• Tests / unittests-macos (3.12, macos-m1-stable) / macos-job (gh) (detected as infra flaky with no log or failing log classifier)
• Tests / unittests-macos (3.9, macos-m1-stable) / macos-job (gh) (detected as infra flaky with no log or failing log classifier)
• Tests / unittests-windows (3.10, windows.4xlarge, cpu) / windows-job (gh) (detected as infra flaky with no log or failing log classifier)
• Tests / unittests-windows (3.11, windows.4xlarge, cpu) / windows-job (gh) (detected as infra flaky with no log or failing log classifier)
• Tests / unittests-windows (3.12, windows.4xlarge, cpu) / windows-job (gh) (detected as infra flaky with no log or failing log classifier)
• Tests / unittests-windows (3.9, windows.4xlarge, cpu) / windows-job (gh) (detected as infra flaky with no log or failing log classifier)
• Tests / unittests-windows (3.9, windows.g5.4xlarge.nvidia.gpu, cuda, 11.8) / windows-job (gh) (detected as infra flaky with no log or failing log classifier)

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