🩹 Allow for last non-servo extruder

Marlin/src/module/tool_change.cpp

 
   void move_extruder_servo(const uint8_t e) {
     planner.synchronize();
-    if (e < EXTRUDERS) {
+    constexpr bool evenExtruders = !(EXTRUDERS & 1);
+    if (evenExtruders || e < EXTRUDERS - 1) {
       servo[_SERVO_NR(e)].move(servo_angles[_SERVO_NR(e)][e & 1]);
       safe_delay(500);
     }