UBaseLegacyWidgetEdMode::AllowWidgetMove

[ILegacyEdModeWidgetInterface](API\Editor\UnrealEd\Tools\ILegacyEdModeWidgetInterface) overrides are just a pass through to the [FLegacyEdModeWidgetHelper](API\Editor\UnrealEd\Tools\FLegacyEdModeWidgetHelper).