Bugfix: Failed to produce identical binary when passing appropriate parameters.

Bugfix: Failed to produce identical binary when passing appropriate parameters.

Taking a binary input with a binary output while passing +nq should result in a byte-for-byte duplicate binary.

Example: "utf8 -f /bin/bash -bB +nq -F /tmp/bash".

This is failing for two reasons:
1) Not using the original string data when printing detected invalid characters.
2) Performing the from codepoint check before checking the binary output check in the function utf8_print_character().

Also remove a redundant not zero check in the error print function utf8_print_character_invalid().
the function utf8_print_character_invalid() is a wrapper to utf8_print_character(), where that check is already performed.