[libgdx] Reverse IK bend positive logic.

This matches SkeletonJson for 1-bone IK. Requires 4.3.39-beta+.

spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/SkeletonBinary.java

@@ -287,7 +287,7 @@ public class SkeletonBinary extends SkeletonLoader {
 					data.skinRequired = (flags & 1) != 0;
 					data.uniform = (flags & 2) != 0;
 					IkConstraintPose setup = data.setup;
-					setup.bendDirection = (flags & 4) != 0 ? 1 : -1;
+					setup.bendDirection = (flags & 4) != 0 ? -1 : 1;
 					setup.compress = (flags & 8) != 0;
 					setup.stretch = (flags & 16) != 0;
 					if ((flags & 32) != 0) setup.mix = (flags & 64) != 0 ? input.readFloat() : 1;