Fixes for PR

com.unity.shadergraph/Editor/Data/Graphs/Vector1MaterialSlot.cs

         [SerializeField]
         float m_DefaultValue;
 
+        [SerializeField]
-            m_Labels = new[] { "X" };
         }
 
         public Vector1MaterialSlot(

com.unity.shadergraph/Editor/Data/Graphs/Vector2MaterialSlot.cs

         [SerializeField]
         Vector2 m_DefaultValue;
 
+        [SerializeField]
-            m_Labels = new[] { "X", "Y" };
         }
 
         public Vector2MaterialSlot(

com.unity.shadergraph/Editor/Data/Graphs/Vector3MaterialSlot.cs

         [SerializeField]
         private Vector3 m_DefaultValue;
 
+        [SerializeField]
-            m_Labels = new[] { "X", "Y", "Z" };
         }
 
         public Vector3MaterialSlot(