repair the proxy startup call

Author: scbedd

eng/common/testproxy/test-proxy-tool.yml

@@ -30,11 +30,13 @@ steps:
       if (Test-Path $overrideVersion) {
         $version = $(Get-Content $overrideVersion -Raw).Trim()
       }
+
+      Write-Host "Installing test-proxy version $version"
+
       dotnet tool install azure.sdk.tools.testproxy `
         --tool-path $(Build.BinariesDirectory)/test-proxy `
         --add-source https://pkgs.dev.azure.com/azure-sdk/public/_packaging/azure-sdk-for-net/nuget/v3/index.json `
         --version $version
-      $(Build.BinariesDirectory)/test-proxy --version
     displayName: "Install test-proxy"
     condition: and(succeeded(), ${{ parameters.condition }})