fix: SuperDebug collapse button keeps submitting form

[caidanw]

I noticed a small bug in the SuperDebug component when it is included as a child of a <form> element. The bug is that when you click the collapse button it will try to submit the form, which I don't think is intended behaviour.

This patch just adds the preventDefault event modifier to the on:click button event.

For anyone that isn't familiar with the preventDefault modifier, all it does is call event.preventDefault() before running the handler. docs

[ciscoheat]

Thank you, glad to know it's being used.

[ciscoheat]

Just released 1.7.3 now with this fix!