🐛 Fix ISR_SHAPING_LOOP_CYCLES (MarlinFirmware#25335)

Author: tombrazier

Marlin/src/module/stepper.h

@@ -220,7 +220,7 @@
 #define ISR_LOOP_CYCLES(R) ((ISR_LOOP_BASE_CYCLES + MIN_ISR_LOOP_CYCLES + MIN_STEPPER_PULSE_CYCLES) * (R - 1) + _MAX(MIN_ISR_LOOP_CYCLES, MIN_STEPPER_PULSE_CYCLES))
 
 // Model input shaping as an extra loop call
-#define ISR_SHAPING_LOOP_CYCLES(R) ((TERN0(HAS_SHAPING, ISR_LOOP_BASE_CYCLES) + TERN0(INPUT_SHAPING_X, ISR_X_STEPPER_CYCLES) + TERN0(INPUT_SHAPING_Y, ISR_Y_STEPPER_CYCLES)) * (R) + (MIN_ISR_LOOP_CYCLES) * (R - 1))
+#define ISR_SHAPING_LOOP_CYCLES(R) TERN0(HAS_SHAPING, (R) * ((ISR_LOOP_BASE_CYCLES) + TERN0(INPUT_SHAPING_X, ISR_X_STEPPER_CYCLES) + TERN0(INPUT_SHAPING_Y, ISR_Y_STEPPER_CYCLES)))
 
 // If linear advance is enabled, then it is handled separately
 #if ENABLED(LIN_ADVANCE)