Delete last way point on pressing "backspace" when using Connection tool

[rkrishnasanka]

Is your feature request related to a problem? Please describe.
When using the connection tool, one needs to completely redo the connection if they make a single mistake. The ability to delete the last waypoint will make life easier

Describe the solution you'd like
When using the connection tool, "Backspace" should delete the last active waypoint.

Describe alternatives you've considered
N/A

Additional context

• It should ignore when its the first waypoint or if no new connection has started.

[rkrishnasanka]

@zyrrron you want to take this ?