Fix stepper timing bug

Marlin/src/module/stepper.h

 #endif
 
 // Add time for each stepper
-#ifdef HAS_X_STEP
+#if HAS_X_STEP
   #define ISR_START_X_STEPPER_CYCLES ISR_START_STEPPER_CYCLES
   #define ISR_X_STEPPER_CYCLES       ISR_STEPPER_CYCLES
 #else
   #define ISR_START_X_STEPPER_CYCLES 0UL
   #define ISR_X_STEPPER_CYCLES       0UL
 #endif
-#ifdef HAS_Y_STEP
+#if HAS_Y_STEP
   #define ISR_START_Y_STEPPER_CYCLES ISR_START_STEPPER_CYCLES
   #define ISR_Y_STEPPER_CYCLES       ISR_STEPPER_CYCLES
 #else
   #define ISR_START_Y_STEPPER_CYCLES 0UL
   #define ISR_Y_STEPPER_CYCLES       0UL
 #endif
-#ifdef HAS_Z_STEP
+#if HAS_Z_STEP
   #define ISR_START_Z_STEPPER_CYCLES ISR_START_STEPPER_CYCLES
   #define ISR_Z_STEPPER_CYCLES       ISR_STEPPER_CYCLES
 #else