curses: Fix timeout handling.

* pinentry/pinentry-curses.c (dialog_run): Remove NO_INPUT.

Cancellation by timeout only worked when no user input. To have the
same behaviour (as other implementations, Qt, GTK, and TTY) which
waits all the input for TIMEOUT (no care of partial input), it's
fixed.

• Fixes-commit: e3bed4f087304ac126e247053fc82a593bec31b6
• Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>