Don't waste extra memory for the brightness timer

openrtx/include/settings.h

@@ -53,7 +53,8 @@ typedef struct
     int8_t utc_timezone;          // Timezone
     bool gps_enabled;             // GPS active
     char callsign[10];            // Plaintext callsign, for future use
-    display_timer_t brightness_timer;    // Standby timer
+    uint8_t display_timer : 4,    // Standby timer
+            not_in_use    : 4;
 }
 __attribute__((packed)) settings_t;
 
@@ -71,7 +72,8 @@ static const settings_t default_settings =
     0,                // UTC Timezone
     false,            // GPS enabled
     "",               // Empty callsign
-    TIMER_30S         // 30 seconds
+    TIMER_30S,        // 30 seconds
+    0                 // not in use
 };
 
 #endif /* SETTINGS_H */