Azure: explicitly specify the installer platform for the SDK

The installer is currently only being built for amd64 but needs an arm64
host as well.  For now, hardcode the platform.

Author: compnerd

.azure/vs2022.yml

@@ -1719,6 +1719,7 @@ stages:
                 -restore
                 -p:RunWixToolsOutOfProc=true
                 -p:ProductArchitecture=$(arch)
+                -p:InstallerPlatform=amd64
                 -p:CERTIFICATE=$(certificate.secureFilePath)
                 -p:PASSPHRASE=$(CERTIFICATE_PASSWORD)
                 -p:PLATFORM_ROOT=$(Pipeline.Workspace)/windows-sdk-$(arch)/Library/Developer/Platforms/Windows.platform