[csharp] Added missing default initialization of scaleX and scaleY parameters which caused incorrectly placed bones with PathConstraints in some cases. Fixes #1222

(cherry picked from commit 651416c620f13beb4ecf98de0a62c1466bc2afaf)

spine-csharp/src/Skeleton.cs

@@ -45,7 +45,7 @@ namespace Spine {
 		internal Skin skin;
 		internal float r = 1, g = 1, b = 1, a = 1;
 		internal float time;
-		internal float scaleX, scaleY;
+		internal float scaleX = 1, scaleY = 1;
 		internal float x, y;
 
 		public SkeletonData Data { get { return data; } }