Fix ignored return value warning

warning: ignoring return value of ‘std::lock_guard<_Mutex>::lock_guard(mutex_type&) [with _Mutex = std::mutex; mutex_type = std::mutex]’, declared with attribute ‘nodiscard’ [-Wunused-result]

This may mean the lock wasn't actually being taken.

interface/src/LODManager.cpp

@@ -64,7 +64,7 @@ void LODManager::setRenderTimes(float presentTime, float engineRunTime, float ba
 }
 
 void LODManager::autoAdjustLOD(float realTimeDelta) {
-    std::lock_guard<std::mutex> { _automaticLODLock };
+    std::lock_guard<std::mutex> lock{ _automaticLODLock };
 
     // The "render time" is the worse of:
     // - engineRunTime: Time spent in the render thread in the engine producing the gpu::Frame N
@@ -300,7 +300,7 @@ void LODManager::resetLODAdjust() {
 }
 
 void LODManager::setAutomaticLODAdjust(bool value) {
-    std::lock_guard<std::mutex> { _automaticLODLock };
+    std::lock_guard<std::mutex> lock{ _automaticLODLock };
     _automaticLODAdjust = value;
     saveSettings();
     emit autoLODChanged();