Node classes that extended LGraphNode used to be able to define an onMouseDown handler to be fired when the mouse is down on a node.

However, 3b4c0b5 seems to have broken that by assigning an onMouseDown rather than create a default instance method on LGraphNode (which can then be overridden with a class override).

This change breaks any nodes that relied on onMouseDown prior, see: rgthree/rgthree-comfy#553

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