Fix HOTP counter increases

[jorti]

When substituting the counter in a HOTP uri, the replacement string needs to be quoted because it contains a &. Quoting it will avoid & to be replaced with the matching portion of the pattern.

See:
https://www.gnu.org/software/bash/manual/html_node/Shell-Parameter-Expansion.html

Fixes #171

[fstecker]

@tadfisher is there any chance you could merge this soon? As long as this isn't fixed, pass-otp does not work with bash 5.2 (at least not for HOTP).

[GereonV]

Until @tadfisher gets around to merge this, one can disable patsub_replacement in shopt for bash.

This should set it up correctly:

if [[ -z "${BASH_ENV}" ]]; then
  export BASH_ENV=~/.bashenv
  echo "export BASH_ENV=~/.bashenv" >> ~/.bashrc
fi
echo "shopt -u patsub_replacement" >> "${BASH_ENV}"