Fix Subtract node default

MaterialGraphProject/Assets/UnityShaderEditor/Editor/Data/Nodes/Math/Basic/SubtractNode.cs

 
         static string Unity_Subtract(
             [Slot(0, Binding.None, 1, 1, 1, 1)] DynamicDimensionVector A,
-            [Slot(1, Binding.None, -1, -1, -1, -1)] DynamicDimensionVector B,
+            [Slot(1, Binding.None, 1, 1, 1, 1)] DynamicDimensionVector B,
             [Slot(2, Binding.None)] out DynamicDimensionVector Out)
         {
             return