[dovecot/core] 84f32e: global: Fix str_begins() usage

[GitHub]

  Branch: refs/heads/master-2.3
  Home:   https://github.com/dovecot/core
  Commit: 84f32ea224fb6e9f51cdfba2345ce1c62fd67d85
      https://github.com/dovecot/core/commit/84f32ea224fb6e9f51cdfba2345ce1c62fd67d85
  Author: Timo Sirainen <timo.sirainen at dovecot.fi>
  Date:   2018-06-12 (Tue, 12 Jun 2018)

  Changed paths:
    M src/lib-fs/fs-posix.c
    M src/lib-program-client/program-client.c

  Log Message:
  -----------
  global: Fix str_begins() usage

I messed up their cherry-pick merging.



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