Fixed DoChanged being called on all dynamic grid drops even if the drop did nothing.

inabox.wpf/DynamicGrid/DynamicDocumentGrid.cs

@@ -466,6 +466,7 @@ namespace InABox.DynamicGrid
                 }
                 if (refresh)
                 {
+                    DoChanged();
                     Refresh(false, true);
                 }
             }

inabox.wpf/DynamicGrid/DynamicGrid.cs

@@ -3434,7 +3434,6 @@ namespace InABox.DynamicGrid
             if(DynamicGridUtils.TryGetDropData(e, out var entityType, out var table))
             {
                 OnDragEnd(entityType, table, e);
-                DoChanged();
             }
             else
             {