Use an explicit constructor for TreeNode

List initialization ended using movable constructors which surprisingly caused data troubles in release mode, at least in VC2019 compiler. The tree being messed up caused crashes while SQL was generated.

I have no explanation for it.

YACReaderLibrary/db/query_parser.h

@@ -45,6 +45,11 @@ public:
         std::string t;
         std::vector<TreeNode> children;
 
+        explicit TreeNode(std::string t, std::vector<TreeNode> children)
+            : t(t), children(children)
+        {
+        }
+
         int buildSqlString(std::string &sqlString, int bindPosition = 0) const;
         int bindValues(QSqlQuery &selectQuery, int bindPosition = 0) const;
     };