Fix dollying exception for ortho and frustum projections

[Amoki]

Describe the bug
Trying to pan in ortho mode throws an error.

Uncaught TypeError: transposedProjectMat.subarray is not a function
    at PanController._unproject (PanController.js:98)
    at PanController.dollyToCanvasPos (PanController.js:77)
    at Scene.<anonymous> (CameraUpdater.js:287)
    at Scene.fire (Component.js:326)
    at fireTickEvents (core.js:185)
    at frame (core.js:153)

To Reproduce
Steps to reproduce the behavior:

1. Open o model in ortho projection
2. Pan
3. Check the console

Expected behavior
Be able to pan in ortho mode.