Remove not needed logic in LoadBackgroundImageButton.OnButtonPressed()

Not needed anymore as ResetState() sets the button unavailable if the image is invalid

Assets/Scripts/GUI/LoadBackgroundImageButton.cs

@@ -43,7 +43,7 @@ public void RefreshDescription()
         }
         override protected void OnButtonPressed()
         {
-            if (ReferenceImage == null || !ReferenceImage.Valid)
+            if (ReferenceImage == null)
             {
                 return;
             }