title: VSCode integrated terminal is defaulting to powershell core
body: <p>I have recently installed powershell core v6.  I wanted to check it out and see what it is like and it is easy to switch to in windows terminal if i want to play with it.  After installing Version 6 though VS code keeps using core for my integrated console despite my settings json pointing to the powershell.exe in system 32.  How can i fix this?  Our environment is all on version 5.1 and core is missing many features and cmdlets that are in 5.1.  I need these when testing scripts i will deploy.  I can add another terminal and it will use powershell 5.1 but since it is not integrated running script blocks fails some times. Here is my settings.json</p>
  
  <pre><code>{
      "terminal.integrated.shell.windows": "C:\\WINDOWS\\System32\\WindowsPowerShell\\v1.0\\powershell.exe",
      "window.zoomLevel": 0,
      "editor.suggestSelection": "first",
      "vsintellicode.modify.editor.suggestSelection": "automaticallyOverrodeDefaultValue",
      "explorer.confirmDragAndDrop": false,
      "files.autoSave": "afterDelay",
      "powershell.powerShellDefaultVersion": "Windows Powershell (x64)",
      "editor.accessibilitySupport": "off"
  }
  </code></pre>