Update signature of relay entrypoint type

Reviewed By: gkz

Differential Revision: D70850593

fbshipit-source-id: 792c7ee10eeca59b7473b4ad3c926eab4cdacf96

Author: SamChou19815

packages/react-relay/relay-hooks/EntryPointTypes.flow.js

@@ -180,7 +180,6 @@ export type EntryPointComponent<
   TExtraProps = null,
   TRenders: React.Node = React.Node,
 > = component(
-  ref?: React.RefSetter<mixed>,
   ...EntryPointProps<
     TPreloadedQueries,
     TPreloadedEntryPoints,