[atServer] Fix an insecure use of strncpy()
[atServer] Fix an insecure use of strncpy()

Resolves: LE-10982
Change-Id: I72afc6b4aadaafd4f9a1bb070246a9b4daa90938

legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af