Valentin Shergin e78bf723bf Fabric: Removed last two plactical usages of ShadowNode::sourceNode_
Summary:
@public
 * In case of `ShadowTree` we just pass original old node as a `commit` method argument;
 * In case of `ConcreteViewShadowNode` we just don't need that because diffing algorithm does not use that information anymore.

Reviewed By: mdvacca

Differential Revision: D8753906

fbshipit-source-id: b8555083c7e72e9b3c0f9a8065745946d4cf44c7
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