feat: improved OLED brightness handling (#3773)

radio/src/gui/128x64/lcd.cpp

@@ -979,6 +979,10 @@ void lcdSetContrast(bool useDefault)
 {
 #if defined(BOOT)
   lcdSetRefVolt(LCD_CONTRAST_DEFAULT);
+#elif defined(OLED_SCREEN)
+  // Handled by brightness feature
+  if (useDefault)
+    lcdSetRefVolt(LCD_CONTRAST_DEFAULT);
 #else
   lcdSetRefVolt(useDefault ? LCD_CONTRAST_DEFAULT : g_eeGeneral.contrast);
 #endif