gui:Fix index error for _remove_treeinfo_repositories() #5516
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The _remove_treeinfo_repositories() try to remove treeinfo repositories from _repo_store[],the index 'path' is saved in removal_repo_list[] and arranged in order.
The problem is that _remove_repository(path) will remove the previous repositories,and the subsequent loops will get a wrong index for _repo_store[].
Fix it by reversing the removal_repo_list[], to secure previous repositories will not be removed before _remove_repository().