Puch has the horn in the ground side of the primary ignition circuit. The horn switch is a normally closed switch.
The switch is wired in parallel to the horn.
Under normal operation the primary side of the ignition gets its ground through the normally closed horn switch. When the horn switch is depressed, the circuit gets its ground through the horn, which produces that annoying gurgling wheezing sound From the horn.
If the horn switch is bad, the horn will sound continuously.
Just leave the wires as they were and yell at people if you feel the urge to.