Cut button can be dismissed without dismissing the highlight

[phet-steele]

@samreid this requires touch input (because I think touchSnag is needed).

1. Connect two elements together and drag their connection near the carousel.
2. Place them in such a way that when the cut button is shown, the button covers (or at least somewhat overlaps) and object in the carousel, like this:

3. Press your finger down on the cut button so it depresses, but don't release.
4. Drag your finger so that touchSnag picks up the element beneath the cut button.

This will dismiss the cut button, but not the highlight around the node.

Seen on macOS 10.12.6 Chrome (with emulated touch) and iPad 2 iOS 9.3.5. For phetsims/qa/issues/55.

URL: https://www.colorado.edu/physics/phet/dev/html/circuit-construction-kit-dc/1.0.0-rc.1/circuit-construction-kit-dc_en.html
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[ariel-phet]

Seems like a non problematic edge case, will investigate as part of 1.1

[samreid]

In design meeting today, we decided it is enough of a corner case that it can be closed.