[ios-sdk] Fixed another extra [FBRequestConnection start] call in FBGraphObjectPagingLoader.
[ios-sdk] Fixed another extra [FBRequestConnection start] call in FBGraphObjectPagingLoader.

Summary: Refactoring of FBRequest left an extra call to start. Removed it.

Test Plan: - Ran Scrumptious, verified paging worked

Reviewers: jacl, mmarucheck

Reviewed By: jacl

CC: platform-diffs@lists

Differential Revision: https://phabricator.fb.com/D477472

Subsplash/facebook-ios-sdk,hibu/facebook-ios-sdk,TimeIncOSS/facebook-ios-sdk,FiftyThree/facebook-ios-sdk,ArtLapitski/facebook-ios-sdk,anthonylai/facebook-ios-sdk,anthonylai/facebook-ios-sdk,ShareKit/facebook-ios-sdk,Citrrus/facebook-ios-sdk,hibu/facebook-ios-sdk,flovilmart/facebook-ios-sdk,flovilmart/facebook-ios-sdk,anthonylai/facebook-ios-sdk,flovilmart/facebook-ios-sdk,1234-/facebook-ios-sdk,beamly/facebook-ios-sdk,Citrrus/facebook-ios-sdk,Amnysia/facebook-ios-sdk,TimeIncOSS/facebook-ios-sdk,tipbit/facebook-ios-sdk,hibu/facebook-ios-sdk,1234-/facebook-ios-sdk,ArtLapitski/facebook-ios-sdk,tipbit/facebook-ios-sdk,flovilmart/facebook-ios-sdk,Amnysia/facebook-ios-sdk,shepting/facebook-ios-sdk,shepting/facebook-ios-sdk,ArtLapitski/facebook-ios-sdk,wooga/facebook-ios-sdk,flovilmart/facebook-ios-sdk,taptaptap/facebook-ios-sdk,beamly/facebook-ios-sdk,1234-/facebook-ios-sdk,taptaptap/facebook-ios-sdk,FiftyThree/facebook-ios-sdk,wooga/facebook-ios-sdk,ArtLapitski/facebook-ios-sdk,shepting/facebook-ios-sdk,beamly/facebook-ios-sdk,Citrrus/facebook-ios-sdk,1234-/facebook-ios-sdk,TimeIncOSS/facebook-ios-sdk,Amnysia/facebook-ios-sdk,wooga/facebook-ios-sdk,hibu/facebook-ios-sdk,FiftyThree/facebook-ios-sdk,hibu/facebook-ios-sdk,taptaptap/facebook-ios-sdk,ShareKit/facebook-ios-sdk,1234-/facebook-ios-sdk,tipbit/facebook-ios-sdk,Subsplash/facebook-ios-sdk,shepting/facebook-ios-sdk,shepting/facebook-ios-sdk,ShareKit/facebook-ios-sdk,Subsplash/facebook-ios-sdk