Fix the problem of unvisible edges weight #75
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I fixed the issue of unvisible edges weight, now the weight of edges can be shown on the edges (I've tested). The problem occurs in the Edge class, specificly the function updateText. The logic in the method is problems.The second else if condition is never executed because it is the complement of the first if condition. Additionally, I would really appreciate it if you could accept this pull request, so that I can complete my software engineering assignment (hhhh). It's also fine if you reject this pr.