[server] Re-add default export for react-redux libdef
[server] Re-add default export for react-redux libdef

See [https://github.com/flow-typed/flow-typed/pull/3012#issuecomment-452799153](here)

Ashoat/squadcal,Ashoat/squadcal,Ashoat/squadcal,Ashoat/squadcal,Ashoat/squadcal,Ashoat/squadcal,Ashoat/squadcal