Use corrected screen size for generating tile size

Screen size != actual size (texture)

Interestingly, this is 'mostly' right at this point.  The per-tile light lists for the right eye might not be exactly right, but the light data in the tile is correctly formatted.  So next is generating the correct information in the tile!

ScriptableRenderPipeline/HDRenderPipeline/HDRP/Lighting/LightLoop/LightLoop.cs

 
         int GetNumTileFtplX(HDCamera hdCamera)
         {
-            return (hdCamera.actualWidth + (LightDefinitions.s_TileSizeFptl - 1)) / LightDefinitions.s_TileSizeFptl;
+            return ((int)hdCamera.screenSize.x + (LightDefinitions.s_TileSizeFptl - 1)) / LightDefinitions.s_TileSizeFptl;
-            return (hdCamera.actualHeight + (LightDefinitions.s_TileSizeFptl - 1)) / LightDefinitions.s_TileSizeFptl;
+            return ((int)hdCamera.screenSize.y + (LightDefinitions.s_TileSizeFptl - 1)) / LightDefinitions.s_TileSizeFptl;
-            return (hdCamera.actualWidth + (LightDefinitions.s_TileSizeClustered - 1)) / LightDefinitions.s_TileSizeClustered;
+            return ((int)hdCamera.screenSize.x + (LightDefinitions.s_TileSizeClustered - 1)) / LightDefinitions.s_TileSizeClustered;
-            return (hdCamera.actualHeight + (LightDefinitions.s_TileSizeClustered - 1)) / LightDefinitions.s_TileSizeClustered;
+            return ((int)hdCamera.screenSize.y + (LightDefinitions.s_TileSizeClustered - 1)) / LightDefinitions.s_TileSizeClustered;
         }
 
         public bool GetFeatureVariantsEnabled()
             var camera = hdCamera.camera;
             cmd.BeginSample("Build Light List");
 
-            var w = camera.pixelWidth;
-            var h = camera.pixelHeight;
+            var w = (int)hdCamera.screenSize.x;
+            var h = (int)hdCamera.screenSize.y;
             s_TempIntArray[0] = w;
             s_TempIntArray[1] = h;
             var numBigTilesX = (w + 63) / 64;