Fix email validator misconfiguration spotted by @NSkelsey in https://github.com/globaleaks/GlobaLeaks/pull/1466/files#r44090278
Fix email validator misconfiguration spotted by @NSkelsey in https://github.com/globaleaks/GlobaLeaks/pull/1466/files#r44090278

vodkina/GlobaLeaks,vodkina/GlobaLeaks,vodkina/GlobaLeaks,vodkina/GlobaLeaks