Fix destroy function

[dsparkplug]

The destroy function was not working at all. It was attempting to remove the data from the jquery collection rather than the instance.

This change removes the data from the instance and also removes the click event handler.

[dsparkplug]

No idea why the build is failing

[hishamtj]

thank you for this fix! weirdly it is still not implemented even in the latest release of the plugin