Minor code cleanup

Marlin/src/lcd/HD44780/ultralcd_HD44780.cpp

@@ -367,11 +367,11 @@ void MarlinUI::init_lcd() {
 }
 
 bool MarlinUI::detected() {
-  return true
+  return (true
     #if EITHER(LCD_I2C_TYPE_MCP23017, LCD_I2C_TYPE_MCP23008) && defined(DETECT_DEVICE)
       && lcd.LcdDetected() == 1
     #endif
-  ;
+  );
 }
 
 #if HAS_SLOW_BUTTONS

Marlin/src/lcd/dogm/ultralcd_DOGM.cpp

@@ -244,13 +244,7 @@ void MarlinUI::init_lcd() {
   #if DISABLED(MKS_LCD12864B)
 
     #if PIN_EXISTS(LCD_BACKLIGHT)
-      OUT_WRITE(LCD_BACKLIGHT_PIN, (
-        #if ENABLED(DELAYED_BACKLIGHT_INIT)
-          LOW  // Illuminate after reset
-        #else
-          HIGH // Illuminate right away
-        #endif
-      ));
+      OUT_WRITE(LCD_BACKLIGHT_PIN, DISABLED(DELAYED_BACKLIGHT_INIT)); // Illuminate after reset or right away
     #endif
 
     #if EITHER(MKS_12864OLED, MKS_12864OLED_SSD1306)

Marlin/src/lcd/extui/lib/dgus/DGUSDisplay.cpp

@@ -441,7 +441,6 @@ void DGUSScreenVariableHandler::DGUSLCD_SendHeaterStatusToDisplay(DGUS_VP_Variab
     DGUSLCD_SendStringToDisplay(var);
   }
 
-
   void DGUSScreenVariableHandler::SDCardInserted() {
     top_file = 0;
     auto cs = ScreenHandler.getCurrentScreen();

Marlin/src/lcd/ultralcd.cpp

@@ -351,10 +351,8 @@ void MarlinUI::init() {
     #endif
   #endif
 
-  #if HAS_ENCODER_ACTION
-    #if HAS_SLOW_BUTTONS
-      slow_buttons = 0;
-    #endif
+  #if HAS_ENCODER_ACTION && HAS_SLOW_BUTTONS
+    slow_buttons = 0;
   #endif
 
   update_buttons();