[pkg-gnupg-maint] Bug#798944: Typo in description

[Yuri D'Elia]

Package: pinentry-tty
Severity: minor

minimal dunb-terminal PIN or pass-phrase entry for GnuPG
          ^

-- System Information:
Debian Release: stretch/sid
  APT prefers unstable
  APT policy: (900, 'unstable'), (800, 'experimental')
Architecture: amd64 (x86_64)

Kernel: Linux 4.1.0-2-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)