scripts: update copyright_header script to include additional files
scripts: update copyright_header script to include additional files

Includes .sh and .bash-completion files in the script as well


Former-commit-id: b024d5e0285948902ca4eba61facacbd46844f75
syscoin/syscoin2,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin2,syscoin/syscoin2,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin2,syscoin/syscoin,syscoin/syscoin2,syscoin/syscoin2,syscoin/syscoin,syscoin/syscoin