test(binary_search_tree): update test param all the language

use param value 7, not 5. function test param value with param value in example picture as same.

codes/javascript/chapter_tree/binary_search_tree.js

@@ -126,7 +126,7 @@ console.log("\n初始化的二叉树为\n");
 printTree(getRoot());
 
 /* 查找结点 */
-let node = search(5);
+let node = search(7);
 console.log("\n查找到的结点对象为 " + node + "，结点值 = " + node.val);
 
 /* 插入结点 */