Changes

diameter: fix wrong 'Vendor-Id' value (should be 3GPP)

Wireshark decodes VID=10515 as follows:

  Vendor-Id: Terry Nazon Inc (10515)

Looks like a typo, it should be VID=10415:

  Vendor-Id: 3GPP (10415)

At least this is what open5gs is using.

Change-Id: I601785a8c71e9c6e6d94018586e2a865ba8b2f11