Make passphrase formatting a simple flag
* pinentry/pinentry.h (struct pinentry): Remove fields formatted_passphrase_label, formatted_passphrase_tt. * pinentry/pinentry.c (pinentry_reset): Remove free'ing of removed fields. (option_handler): Treat option "formatted-passphrase" as simple flag. Remove options "formatted-passphrase-label", "formatted-passphrase-tt".