Fixed ng build command

Author: staviloglu

aspnet-core/build/build-with-ng.ps1

@@ -25,7 +25,7 @@ dotnet publish --output (Join-Path $outputFolder "Host")
 
 Set-Location $ngFolder
 & yarn
-& ng build -prod
+& ng build --prod
 Copy-Item (Join-Path $ngFolder "dist") (Join-Path $outputFolder "ng") -Recurse
 Copy-Item (Join-Path $ngFolder "Dockerfile") (Join-Path $outputFolder "ng")
 
@@ -54,4 +54,4 @@ Copy-Item (Join-Path $slnFolder "docker/ng/*.*") $outputFolder
 
 ## FINALIZE ###################################################################
 
-Set-Location $outputFolder
+Set-Location $outputFolder