Use super pattern in Canvas__init__ for better consistency.

Author: Alan

ipympl/backend_nbagg.py

@@ -238,9 +238,8 @@ class Canvas(DOMWidget, FigureCanvasWebAggCore):
     # Static as it should be the same for all canvases
     current_dpi_ratio = 1.0
 
-    def __init__(self, figure, *args, **kwargs):
-        DOMWidget.__init__(self, *args, **kwargs)
-        FigureCanvasWebAggCore.__init__(self, figure, *args, **kwargs)
+    def __init__(self, figure, **kwargs):
+        super().__init__(figure=figure, **kwargs)
 
         self.on_msg(self._handle_message)