Remove stale comment and update another usage of legacy XR to remove pragma

Author: keveleigh

Assets/MixedRealityToolkit/Utilities/Editor/Setup/MixedRealityProjectConfigurator.cs

@@ -99,8 +99,6 @@ public bool IsActiveBuildTargetValid()
             { Configurations.LatestScriptingRuntime, new ConfigGetter(() => { return IsLatestScriptingRuntime(); }) },
             { Configurations.ForceTextSerialization, new ConfigGetter(() => { return IsForceTextSerialization(); }) },
             { Configurations.VisibleMetaFiles, new ConfigGetter(() => { return IsVisibleMetaFiles(); }) },
-            // Ensure compatibility with the pre-2019.3 XR architecture for customers / platforms
-            // with legacy requirements.
             { Configurations.VirtualRealitySupported, new ConfigGetter(() => { return XRSettingsUtilities.LegacyXREnabled; }) },
             { Configurations.SinglePassInstancing, new ConfigGetter(() => { return MixedRealityOptimizeUtils.IsSinglePassInstanced(); }) },
             { Configurations.SpatialAwarenessLayer, new ConfigGetter(() => { return HasSpatialAwarenessLayer(); }) },
@@ -132,16 +130,12 @@ public bool IsActiveBuildTargetValid()
         };
 
         // The configure functions for each type of setting
-        private static Dictionary<Configurations, Action> ConfigurationSetters = new Dictionary<Configurations, Action>()
+        private static readonly Dictionary<Configurations, Action> ConfigurationSetters = new Dictionary<Configurations, Action>()
         {
             { Configurations.LatestScriptingRuntime, () => { SetLatestScriptingRuntime(); } },
             { Configurations.ForceTextSerialization,  () => { SetForceTextSerialization(); } },
             { Configurations.VisibleMetaFiles,  () => { SetVisibleMetaFiles(); } },
-            // Ensure compatibility with the pre-2019.3 XR architecture for customers / platforms
-            // with legacy requirements.
-#pragma warning disable 0618
-            { Configurations.VirtualRealitySupported,  () => { PlayerSettings.virtualRealitySupported = true; } },
-#pragma warning restore 0618
+            { Configurations.VirtualRealitySupported,  () => { XRSettingsUtilities.LegacyXREnabled = true; } },
             { Configurations.SinglePassInstancing,  () => { MixedRealityOptimizeUtils.SetSinglePassInstanced(); } },
             { Configurations.SpatialAwarenessLayer,  () => { SetSpatialAwarenessLayer(); } },
             { Configurations.EnableMSBuildForUnity, () => { PackageManifestUpdater.EnsureMSBuildForUnity(); } },