Modify the judgment method of manifest mode #1464
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Fixes microsoft/vcpkg#36888
As mentioned in the issue above, when my vcpkg has a parent directory and there is a vcpkg.json file in the parent directory, when I install the port in classic mode in vcpkg, it will be mistakenly judged as manifest mode.
I modified the determination method of the manifest mode. The manifest mode is used only when the path of the vcpkg.json file does not coincide with the vcpkg classic mode path, otherwise the classic mode is used.