MFH: r457009

mail/thunderbird: update to 52.5.2

Changes: https://www.mozilla.org/thunderbird/52.5.2/releasenotes/
Security: https://hg.mozilla.org/releases/comm-esr52/rev/01f2c40a0ce9
Security: https://hg.mozilla.org/releases/comm-esr52/rev/6c35468148bb
Security: https://hg.mozilla.org/releases/comm-esr52/rev/67c559a7ffee
Security: https://hg.mozilla.org/releases/comm-esr52/rev/8bc93e746d82
Approved by: ports-secteam blanket