Fix weather sounds persisting on a new game

apps/openmw/mwworld/weather.cpp

@@ -167,6 +167,11 @@ WeatherManager::WeatherManager(MWRender::RenderingManager* rendering,MWWorld::Fa
     setFallbackWeather(blizzard,"blizzard");
 }
 
+WeatherManager::~WeatherManager()
+{
+    stopSounds(true);
+}
+
 void WeatherManager::setWeather(const String& weather, bool instant)
 {
     if (weather == mCurrentWeather && mNextWeather == "")

apps/openmw/mwworld/weather.hpp

@@ -120,6 +120,7 @@ namespace MWWorld
     {
     public:
         WeatherManager(MWRender::RenderingManager*,MWWorld::Fallback* fallback);
+        ~WeatherManager();
 
         /**
          * Change the weather in the specified region