Remove npx.ps1

Author: nirinchev

.evergreen/InstallNode.ps1

@@ -23,5 +23,6 @@ Remove-Item .\npm.cmd
 if (Test-Path .\npm.ps1) { Remove-Item .\npm.ps1 }
 Remove-Item .\npx
 Remove-Item .\npx.cmd
+if (Test-Path .\npx.ps1) { Remove-Item .\npx.ps1 }
 Move-Item .\node_modules\npm -Destination .\node_modules\npm2
 .\node.exe .\node_modules\npm2\bin\npm-cli.js i -g npm@6