title: Unity: Conflict between new InputSystem and old EventSystem
body: <p>When using the new InputSystem. If I add a Canvas component to my Scene it brings automatically the old EventSystem and I see this error in my console:</p>
  <pre><code>InvalidOperationException: You are trying to read Input using the UnityEngine.Input class, but you have switched active Input handling to Input System package in Player Settings.
  UnityEngine.Input.get_mousePosition () (at &lt;213e6bf8f2dd495fbd693e6ce506136b&gt;:0)
  UnityEngine.UI.MultipleDisplayUtilities.GetMousePositionRelativeToMainDisplayResolution () (at /Applications/Unity/Hub/Editor/2020.1.14f1/Unity.app/Contents/Resources/PackageManager/BuiltInPackages/com.unity.ugui/Runtime/UI/Core/MultipleDisplayUtilities.cs:40)
  UnityEngine.EventSystems.BaseInput.get_mousePosition () (at /Applications/Unity/Hub/Editor/2020.1.14f1/Unity.app/Contents/Resources/PackageManager/BuiltInPackages/com.unity.ugui/Runtime/EventSystem/InputModules/BaseInput.cs:75)
  UnityEngine.EventSystems.StandaloneInputModule.UpdateModule () (at /Applications/Unity/Hub/Editor/2020.1.14f1/Unity.app/Contents/Resources/PackageManager/BuiltInPackages/com.unity.ugui/Runtime/EventSystem/InputModules/StandaloneInputModule.cs:175)
  UnityEngine.EventSystems.EventSystem.TickModules () (at /Applications/Unity/Hub/Editor/2020.1.14f1/Unity.app/Contents/Resources/PackageManager/BuiltInPackages/com.unity.ugui/Runtime/EventSystem/EventSystem.cs:328)
  UnityEngine.EventSystems.EventSystem.Update () (at /Applications/Unity/Hub/Editor/2020.1.14f1/Unity.app/Contents/Resources/PackageManager/BuiltInPackages/com.unity.ugui/Runtime/EventSystem/EventSystem.cs:343)
  </code></pre>