InputField can't be focused in VR#528

Reproduction steps:

• Launch VR (tested in HP Reverb G2)
• import object with an inputfield on (like the one with attached script)
  x try to focus any of the fields (I tried to map various actions on controllers and none of them seems to get focus)
  x use virtual keyboard to enter value

expected: user in VR can focus and enter a value into InputField