Fix magic projectile sound disappearing after multiple save/load cycles

apps/openmw/mwworld/projectilemanager.cpp

@@ -409,6 +409,7 @@ namespace MWWorld
             MWBase::SoundManager *sndMgr = MWBase::Environment::get().getSoundManager();
             state.mSound = sndMgr->playManualSound3D(esm.mPosition, esm.mSound, 1.0f, 1.0f,
                                                      MWBase::SoundManager::Play_TypeSfx, MWBase::SoundManager::Play_Loop);
+            state.mSoundId = esm.mSound;
 
             mMagicBolts.push_back(state);
             return true;