fix: disabling start for middle mouse button

[cgood92]

Fix: disabling start for middle mouse button

There are 5 possible values for event.button:

0: Main button pressed, usually the left button or the un-initialized state 1: Auxiliary button pressed, usually the wheel button or the middle button (if present) 2: Secondary button pressed, usually the right button 3: Fourth button, typically the Browser Back button 4: Fifth button, typically the Browser Forward button

(Source: https://developer.mozilla.org/en-US/docs/Web/API/MouseEvent/button)

We should not start dragging if either middle or right mouse buttons are clicked

I did not see any unit tests, please let me know if I missed that, as I would be happy to add a unit test.

[codesandbox-ci[bot]]

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