RFR: Parse the bidirectional option properly

[Robin Westberg]

Hi all,

Please review this minor change that properly interprets the bidirectional option for the mailinglist bridge bot.

Best regards,
Robin

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Commit messages:
 - The bidirectional option was inverted

Changes: https://git.openjdk.java.net/skara/pull/559/files
 Webrev: https://webrevs.openjdk.java.net/skara/559/webrev.00
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/skara/pull/559.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/559/head:pull/559

PR: https://git.openjdk.java.net/skara/pull/559