Fix form submission on native if there is an onclick handler somewhere

[mohe2015]

Closes #3904
See also #3791 (comment)
Related PR #3804

[jkelleyrtp]

From what I can tell this PR doesn't actually do anything - just inlines the preventsDefault function and then deletes the other line?

Ahhhhh read through the linked issue and then realized what's happening.

There was a logic bug here:

    let form = target.closest("form");
    if (target.tagName === "BUTTON" && (event.type == "submit" || form)) {
      event.preventDefault();
    }

The event handling happens in two phases:

• A PointerEvent (click)
• A SubmitEvent

We were cancelling the PointerEvent which then cancelled the submit event.

We should only be cancelling submit events. Click events should still fire.

The PR looks good, thanks for the fix.