SSTP no longer recognized

Summary

It still worked on 3.0.5 and I read that it also worked with 3.0.12 but since 3.1.0 it is broken.

Steps to reproduce

Just try the sample: https://wiki.wireshark.org/SSTP

With 3.0.5, it will correctly recognize SSTP after setting up TLS decryption. With the current release version, the packets stay HTTP and no SSTP or PPP headers are recognized.

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