fix factory reset (light amp and flashlight power)

src/menu.rs

@@ -803,7 +803,7 @@ pub fn handle_input(
             MenuAction::ResetSettings => {
                 ew_sfx.send(audio::PlaySfxEvent(audio::Sfx::PowerDown));
                 *settings = Settings::default();
-                *prefs = Preferences::default();
+                prefs.reset();
                 // prefs.save(); // prefs are saved by the GameEvents already
                 ew_game.send(GameEvent::SetShadows(Turn::Unchanged));
                 ew_game.send(GameEvent::SetFullscreen(Turn::Unchanged));

src/var.rs

@@ -543,6 +543,14 @@ impl Preferences {
             }
         }
     }
+
+    pub fn reset(&mut self) {
+        *self = Preferences::default();
+
+        // why is this necessary?...
+        self.light_amp = Preferences::default_light_amp();
+        self.flashlight_power = Preferences::default_flashlight_power();
+    }
 }
 
 fn file_is_readable(file_path: &str) -> bool {