fix(namespace): remove definition of InboxNamespace#threads() from namespace.js
fix(namespace): remove definition of InboxNamespace#threads() from namespace.js

MobileWorks/inbox.js,nylas/inbox.js,iconartus/inbox.js,iconartus/inbox.js,MobileWorks/inbox.js,iconartus/inbox.js,MobileWorks/inbox.js,nylas/inbox.js