🐛 Fix EZBoard V2 timer conflict (#23648)

buildroot/share/PlatformIO/variants/MARLIN_TH3D_EZBOARD_V2/variant.h

 // Timer Definitions
 // Use TIM6/TIM7 when possible as servo and tone don't need GPIO output pin
 #define TIMER_TONE              TIM5
-#define TIMER_SERVO             TIM7
+#define TIMER_SERVO             TIM4
 
 // UART Definitions
 // Define here Serial instance number to map on Serial generic name