🐛 Fix Mixing code typos (#22697)

Marlin/src/module/planner.cpp

@@ -2131,7 +2131,7 @@ bool Planner::_populate_block(block_t * const block, bool split_move,
   // Bail if this is a zero-length block
   if (block->step_event_count < MIN_STEPS_PER_SEGMENT) return false;
 
-  TERN_(MIXING_EXTRUDER, mixer.populate_block(block->b_color))
+  TERN_(MIXING_EXTRUDER, mixer.populate_block(block->b_color));
 
   TERN_(HAS_CUTTER, block->cutter_power = cutter.power);
 

Marlin/src/module/stepper.cpp

@@ -2205,7 +2205,7 @@ uint32_t Stepper::block_phase_isr() {
       accelerate_until = current_block->accelerate_until << oversampling;
       decelerate_after = current_block->decelerate_after << oversampling;
 
-      TERN_(MIXING_EXTRUDER, mixer.stepper_setup(current_block->b_color))
+      TERN_(MIXING_EXTRUDER, mixer.stepper_setup(current_block->b_color));
 
       TERN_(HAS_MULTI_EXTRUDER, stepper_extruder = current_block->extruder);