Input shaping tool - Y Zeta script - fix final retract sign

Specific to Y axis zeta script generation. Final `extrude` to do final retraction applies user input with no / `+` sign, where it should do it with `-` sign. Example GCODE now live ```gcode G0 X48.80 Y143.80 Z0.28 E190.81 F6000.0 ; retract G1 E191.81 ``` expected / with fix ```gcode G0 X48.80 Y143.80 Z0.28 E190.81 F6000.0 ; retract G1 E189.81 ``` Freq and X already display this behavior, e.g. X zeta ```gcode G0 X148.80 Y43.80 Z0.28 E190.81 F6000.0 ; retract G1 E189.81 ```