fix comparator output spike by forcing re-convergence on switch state change (#90)

When the analog switch changes state during Newton-Raphson subiterations,
force sim.converged = false to ensure additional iterations settle the
circuit. This prevents brief voltage spikes when the switch transitions
between open and closed states, particularly in the ComparatorElm where
the OpAmp output and AnalogSwitch react with a one-subiteration lag.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: esaruoho

src/com/lushprojects/circuitjs1/client/AnalogSwitchElm.java

@@ -150,9 +150,12 @@ void stamp() {
 	}
     }
     void doStep() {
+	boolean wasOpen = open;
 	open = (volts[2] < threshold);
 	if (hasFlag(FLAG_INVERT))
 	    open = !open;
+	if (open != wasOpen)
+	    sim.converged = false;
 
 	// if pulldown flag is set, resistance is r_on.  Otherwise, no connection.
 	// if pulldown flag is unset, resistance is r_on for on, r_off for off.