Making a ProxyShape a live surface is broken in VP2.0

**Describe the bug**
No geometry is created when trying to use a create tool with a ProxyShape that is made live when using Viewport 2.0.

**Steps to reproduce**
Steps to reproduce the behavior:
1. Run the testProxyShapeLiveSurface. Observe the failed assert

**Expected behavior**
The test passes with no errors.

**Additional context**
This test is part of a suite of tests that are run internally at Pixar. They are not included run as part of the external Pixar usdMaya plugin tests since they are making assumptions about the runtime environment that may not be valid for all users. However, moving forward, these tests should be run internally within Autodesk to validate correctness when testing any changes or fixes to the usdMaya plugin.