PowerManager.EffectivePowerMode should not be IAsyncOperation<T> typed as a property

[jonwis]

Describe the bug

This property should instead be EffectivePowerMode EffectivePowerMode { get; } - WinRT properties aren't supposed to be of type IAsyncOperation<T> or IAsyncAction except in some very special cases.

See #1142 for where this was introduced,

WindowsAppSDK/dev/PowerNotifications/PowerNotifications.idl

Line 98 in 97943aa

static Windows.Foundation.IAsyncOperation<EffectivePowerMode> EffectivePowerMode{ get; };

for details.

Steps to reproduce the bug

Try to use the PowerManager.EffectivePowerMode property, observe that it is async-op instead of just the mode.

Expected behavior

No response

Screenshots

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NuGet package version

1.0.0-preview3

Packaging type

No response

Windows version

No response

IDE

No response

Additional context

No response