[May18] Disable keyboard for the MRTK keyboard's inputfield (#2169)

* Disable keyboard for the MRTK keyboard's inputfield

* Adding comment to Keyboard disabling

Author: keveleigh

Assets/HoloToolkit/UX/Scripts/Keyboard.cs

@@ -251,6 +251,10 @@ protected override void Awake()
                 }
             }
 
+            // Setting the keyboardType to an undefined TouchScreenKeyboardType,
+            // which prevents the MRTK keyboard from triggering the system keyboard itself.
+            InputField.keyboardType = (TouchScreenKeyboardType)(-1);
+
             // Keep keyboard deactivated until needed
             gameObject.SetActive(false);
         }