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404.左叶子之和增加Go递归精简版

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Original file line number	Diff line number	Diff line change
`@@ -337,6 +337,21 @@ func sumOfLeftLeaves(root *TreeNode) int {`
`337`	`337`	`}`
`338`	`338`	```
`339`	`339`
	`340`	`+递归精简版`
	`341`	`+`
	`342`	+```go
	`343`	`+func sumOfLeftLeaves(root *TreeNode) int {`
	`344`	`+ if root == nil {`
	`345`	`+ return 0`
	`346`	`+ }`
	`347`	`+ leftValue := 0`
	`348`	`+ if root.Left != nil && root.Left.Left == nil && root.Left.Right == nil {`
	`349`	`+ leftValue = root.Left.Val`
	`350`	`+ }`
	`351`	`+ return leftValue + sumOfLeftLeaves(root.Left) + sumOfLeftLeaves(root.Right)`
	`352`	`+}`
	`353`	+```
	`354`	`+`
`340`	`355`	`迭代法(前序遍历)`
`341`	`356`
`342`	`357`	```go

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