fix keyseq error (#663)
fix keyseq error (#663)

Summary

convertFromRawToDraftState had a typo in the code, keyseq should have been keySeq. Seen on #660

Test Plan

Run the entity example, and make sure the convertFromRaw function works
TripleDip/draft-js,tonygentilcore/draft-js,dirkholsopple/draft-js,dirkholsopple/draft-js,facebook/draft-js,SciMts/draft-js,johnmpotter/draft-js,TripleDip/draft-js,tonygentilcore/draft-js,SciMts/draft-js,johnmpotter/draft-js