disabled buttons are still clickable

[kayra1]

Describe the bug

Even though the frontend UI shows the disabled cursor and greys out the actions for certificates, clicking them will still execute whatever the function is. This should not happen

To Reproduce

Insert a csr into Notary.
Click any of the disabled actions.

Expected behavior

Buttons should do nothing when clicked.

[gruyaume]

This seems to be caused by the use of onMouseDown and easily fixed by switching to onClick instead.

Some buttons handle this correctly (ex. Submit in the Add Certificate Request modal) and those all use onClick.