🎨 Misc. style and cleanup

Marlin/src/lcd/e3v2/common/dwin_api.cpp

  */
 #include "../../../inc/MarlinConfigPre.h"
 
-#if EITHER(HAS_DWIN_E3V2, IS_DWIN_MARLINUI)
+#if HAS_DWIN_E3V2 || IS_DWIN_MARLINUI
 
 #include "dwin_api.h"
 #include "dwin_set.h"

Marlin/src/module/settings.cpp

         _FIELD_TEST(lcd_contrast);
         uint8_t lcd_contrast;
         EEPROM_READ(lcd_contrast);
-        if (!validating) {
-          TERN_(HAS_LCD_CONTRAST, ui.set_contrast(lcd_contrast));
-        }
+        TERN_(HAS_LCD_CONTRAST, if (!validating) ui.set_contrast(lcd_contrast));
       }
 
       //

Marlin/src/pins/lpc1768/pins_BTT_SKR_V1_4.h

 #define EXP2_09_PIN                        P0_15
 #define EXP2_10_PIN                        P0_17
 
-#if EITHER(HAS_DWIN_E3V2, IS_DWIN_MARLINUI)
+#if HAS_DWIN_E3V2 || IS_DWIN_MARLINUI
 
   // RET6 DWIN ENCODER LCD
   #define BTN_ENC                    EXP1_06_PIN

Marlin/src/pins/lpc1769/pins_BTT_SKR_E3_TURBO.h

 #define EXP1_09_PIN                        P0_16
 #define EXP1_10_PIN                        P2_08
 
-#if EITHER(HAS_DWIN_E3V2, IS_DWIN_MARLINUI)
+#if HAS_DWIN_E3V2 || IS_DWIN_MARLINUI
   #error "Ender-3 V2 display requires a custom cable with TX = P0_15, RX = P0_16. Comment out this line to continue."
 
  /**

Marlin/src/pins/stm32f1/pins_BTT_SKR_MINI_E3_common.h

   #define EXP1_3                            PB7
 #endif
 
-#if EITHER(HAS_DWIN_E3V2, IS_DWIN_MARLINUI)
+#if HAS_DWIN_E3V2 || IS_DWIN_MARLINUI
   /**
    *        ------                ------                ------
    * (ENT) |10  9 | (BEEP)       |10  9 |              |10  9 |

Marlin/src/pins/stm32f1/pins_CREALITY_V4.h

     #error "Define RET6_12864_LCD or VET6_12864_LCD to select pins for CR10_STOCKDISPLAY with the Creality V4 controller."
   #endif
 
-#elif EITHER(HAS_DWIN_E3V2, IS_DWIN_MARLINUI)
+#elif HAS_DWIN_E3V2 || IS_DWIN_MARLINUI
 
   // RET6 DWIN ENCODER LCD
   #define BTN_ENC                           PB14

Marlin/src/pins/stm32f1/pins_CREALITY_V4210.h

   #define BTN_EN1                    EXP1_08_PIN
   #define BTN_EN2                    EXP1_06_PIN
 
-#elif EITHER(HAS_DWIN_E3V2, IS_DWIN_MARLINUI)
+#elif HAS_DWIN_E3V2 || IS_DWIN_MARLINUI
 
   // RET6 DWIN ENCODER LCD
   #define BTN_ENC                           PB14