Only do stereo rendering in play mode

Author: Chman

PostProcessing/Runtime/Utils/RuntimeUtilities.cs

@@ -227,7 +227,8 @@ public static bool isSinglePassStereoEnabled
             {
 #if UNITY_EDITOR
                 return UnityEditor.PlayerSettings.virtualRealitySupported
-                    && UnityEditor.PlayerSettings.stereoRenderingPath == UnityEditor.StereoRenderingPath.SinglePass;
+                    && UnityEditor.PlayerSettings.stereoRenderingPath == UnityEditor.StereoRenderingPath.SinglePass
+                    && Application.isPlaying;
 #else
                 return false;
 #endif