[Windows Arm64] Remove device_type property (#134181)

The Windows Arm64 tests are failing to start as no machines match
desired properties. This removes the `device_type: none` property as no
Windows Arm64 machines match this ([with
`device_type`](https://chromium-swarm.appspot.com/botlist?c=id&c=task&c=os&c=status&d=asc&f=cpu%3Aarm64&f=os%3AWindows&f=pool%3Aluci.flutter.staging&f=device_type%3Anone&s=id),
[without
`device_type`](https://chromium-swarm.appspot.com/botlist?c=id&c=task&c=os&c=status&d=asc&f=cpu%3Aarm64&f=os%3AWindows&f=pool%3Aluci.flutter.staging&s=id)).

This allows the tests to run on the Windows Arm64 machine pool. [I
tested this manually using
`led`](d96efacb0c/+/build.proto?server=chromium-swarm.appspot.com).

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.ci.yaml

@@ -204,7 +204,6 @@ platform_properties:
           {"dependency": "certs", "version": "version:9563bb"}
         ]
       os: Windows
-      device_type: none
       cpu: arm64
   windows_android:
     properties: