🔨🩹 Drop old ULTIPANEL sanity check

Author: thinkyhead

Marlin/src/inc/SanityCheck.h

@@ -1888,12 +1888,8 @@ static_assert(NUM_SERVOS <= NUM_SERVO_PLUGS, "NUM_SERVOS (or some servo index) i
 #endif
 
 /**
- * ULTIPANEL expects an encoder
+ * Encoder pulses must be positive
  */
-#if IS_ULTIPANEL && NONE(HAS_ROTARY_ENCODER, SR_LCD_2W_NL, SR_LCD_3W_NL, TOUCH_SCREEN, HAS_TOUCH_BUTTONS, HAS_SLOW_BUTTONS) && !ANY_PIN(SHIFT_CLK, ADC_KEYPAD)
-  #error "ULTIPANEL controllers require some kind of encoder."
-#endif
-
 #if ENCODER_PULSES_PER_STEP < 0
   #error "ENCODER_PULSES_PER_STEP should not be negative, use REVERSE_MENU_DIRECTION instead."
 #endif