lib-sieve: sieve-error - Remove prefix support from master error handler.

src/lib-sieve/sieve-error.c

src/lib-sieve/sieve-error.h

src/plugins/doveadm-sieve/doveadm-sieve-cmd-activate.c

src/plugins/doveadm-sieve/doveadm-sieve-cmd-put.c

src/plugins/imap-filter-sieve/imap-filter-sieve.c

src/plugins/imapsieve/imap-sieve.c

src/plugins/lda-sieve/lda-sieve-plugin.c