small refactor for Unity 2018 part 2

Author: RogPodge

Assets/MRTK/Core/Utilities/Editor/Setup/MixedRealityProjectConfigurator.cs

@@ -120,7 +120,7 @@ public bool IsActiveBuildTargetValid()
             { Configurations.ForceTextSerialization, new ConfigGetter(IsForceTextSerialization) },
             { Configurations.VisibleMetaFiles, new ConfigGetter(IsVisibleMetaFiles) },
 #if !UNITY_2019_3_OR_NEWER
-            { Configurations.VirtualRealitySupported, new ConfigGetter(() => XRSettingsUtilities.LegacyXREnabled) },
+            { Configurations.VirtualRealitySupported, new ConfigGetter(() => XRSettingsEditorUtilities.LegacyXREnabled) },
 #endif // !UNITY_2019_3_OR_NEWER
             { Configurations.OptimalRenderingPath, new ConfigGetter(MixedRealityOptimizeUtils.IsOptimalRenderingPath) },
             { Configurations.SpatialAwarenessLayer, new ConfigGetter(HasSpatialAwarenessLayer) },