Change FILE_CHAR_BLOCKLIST to FILE_CHARS_DISALLOWED
Change FILE_CHAR_BLOCKLIST to FILE_CHARS_DISALLOWED

Blocklist is ambiguous. It could mean a list of blocks.

Example: "blocknotify" in the same file refers to Bitcoin blocks.

Former-commit-id: 615b776d392e777417782397fb2e896aa3078386
syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin