simplify PolygonScanner factory method

Author: antonfirsov

src/ImageSharp.Drawing/Processing/Processors/Drawing/FillRegionProcessor{TPixel}.cs

@@ -3,6 +3,7 @@
 
 using System;
 using System.Buffers;
+using SixLabors.ImageSharp.Drawing.Shapes;
 using SixLabors.ImageSharp.Drawing.Shapes.Rasterization;
 using SixLabors.ImageSharp.Memory;
 using SixLabors.ImageSharp.PixelFormats;
@@ -71,12 +72,12 @@ protected override void OnFrameApply(ImageFrame<TPixel> source)
             bool scanlineDirty = true;
 
             var scanner = PolygonScanner.Create(
-                region,
+                region.Shape,
                 minY,
                 maxY,
                 subpixelCount,
                 shapeOptions.IntersectionRule,
-                configuration,
+                configuration.MemoryAllocator,
                 shapeOptions.OrientationHandling);
 
             try

src/ImageSharp.Drawing/Shapes/Rasterization/PolygonScanner.cs

@@ -97,7 +97,7 @@ public static PolygonScanner Create(
             int subsampling,
             IntersectionRule intersectionRule,
             MemoryAllocator allocator,
-            OrientationHandling orientationHandling = OrientationHandling.FirstRingIsContourFollowedByHoles)
+            OrientationHandling orientationHandling)
         {
             TessellatedMultipolygon multipolygon = TessellatedMultipolygon.Create(polygon, allocator, orientationHandling);
             ScanEdgeCollection edges = ScanEdgeCollection.Create(multipolygon, allocator, subsampling);
@@ -106,16 +106,6 @@ public static PolygonScanner Create(
             return scanner;
         }
 
-        public static PolygonScanner Create(
-            Region region,
-            int minY,
-            int maxY,
-            int subsampling,
-            IntersectionRule intersectionRule,
-            Configuration configuration,
-            OrientationHandling orientationHandling = OrientationHandling.FirstRingIsContourFollowedByHoles)
-            => Create(region.Shape, minY, maxY, subsampling, intersectionRule, configuration.MemoryAllocator, orientationHandling);
-
         private void Init()
         {
             // Reuse memory buffers of 'intersections' and 'activeEdges' for key-value sorting,