Make HAL ISR macros function-like

Marlin/src/module/stepper.cpp

@@ -1246,7 +1246,7 @@ void Stepper::set_directions() {
  * Directly pulses the stepper motors at high frequency.
  */
 
-HAL_STEP_TIMER_ISR {
+HAL_STEP_TIMER_ISR() {
   HAL_timer_isr_prologue(STEP_TIMER_NUM);
 
   Stepper::isr();