Fixes for Blend node

MaterialGraphProject/Assets/UnityShaderEditor/Editor/Data/Nodes/Artistic/Blend/BlendNode.cs

             return
                 @"
 {
-    Out = B / (A + 0.000000000001);
+    Out = A / (B + 0.000000000001);
 }";
         }
 
             return
                 @"
 {
-    Out = B - A;
+    Out = A - B;
 }
 ";
         }