The heuristic for T.125 per is too week and we do not have a PER dissector
for T.125 so remove the test.
Remove unused hf entries.
Fixes bug 10350.

Change-Id: If28de7877388c669082f8c8a21dd63107d417fbf
Reviewed-on: https://code.wireshark.org/review/3458
Reviewed-by: Anders Broman <a.broman58@gmail.com>
(cherry picked from commit 892703f9181fe98e87926c70b348b6df3e69c82e)
Reviewed-on: https://code.wireshark.org/review/4268
Reviewed-by: Pascal Quantin <pascal.quantin@gmail.com>