fix Kernel32.GetSystemTimes usage on Windows

[sxtfv]

systemUserTime & systemKernelTime were mixed up
The method is declared as

internal static partial class Kernel32
{
    [LibraryImport(Libraries.Kernel32, SetLastError = true)]
    [return: MarshalAs(UnmanagedType.Bool)]
    internal static partial bool GetSystemTimes(out long idle, out long kernel, out long user);
}

Method's documentation https://learn.microsoft.com/en-us/windows/win32/api/processthreadsapi/nf-processthreadsapi-getsystemtimes

All other usages of this method are correct

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Issue Details

---

systemUserTime & systemKernelTime were mixed up
The method is declared as

internal static partial class Kernel32
{
    [LibraryImport(Libraries.Kernel32, SetLastError = true)]
    [return: MarshalAs(UnmanagedType.Bool)]
    internal static partial bool GetSystemTimes(out long idle, out long kernel, out long user);
}

Method's documentation https://learn.microsoft.com/en-us/windows/win32/api/processthreadsapi/nf-processthreadsapi-getsystemtimes

All other usages of this method are correct

Author:	sxtfv
Assignees:	-
Labels:	area-System.Diagnostics.Tracing
Milestone:	-

[sxtfv]

@dotnet-policy-service agree

[xtqqczze]

Issue has been present since dotnet/coreclr#23680.

[tarekgh]

Thanks @sxtfv for the catch!