relax type annotation for ScatterTernary trace style

Author: kMutagene

src/Plotly.NET/Traces/TraceTernary.fs

@@ -65,7 +65,7 @@ type TraceTernaryStyle() =
             [<Optional;DefaultParameterValue(null)>] ?Sum               : #IConvertible
 
         ) =
-            fun (trace: TraceTernary) ->
+            fun (trace: #Trace) ->
 
                 Name              |> DynObj.setValueOpt trace "name"
                 Visible           |> DynObj.setValueOptBy trace "visible" StyleParam.Visible.convert