Fixed an incorrect replace of const value in util/options_helper.cc
Fixed an incorrect replace of const value in util/options_helper.cc

Summary: Fixed an incorrect replace of const value in util/options_helper.cc

Test Plan: options_test

Reviewers: igor, sdong

Subscribers: dhruba, leveldb

Differential Revision: https://reviews.facebook.net/D48513

ryneli/rocksdb,Andymic/rocksdb,Vaisman/rocksdb,wenduo/rocksdb,jalexanderqed/rocksdb,Vaisman/rocksdb,facebook/rocksdb,Andymic/rocksdb,bbiao/rocksdb,Vaisman/rocksdb,vmx/rocksdb,OverlordQ/rocksdb,bbiao/rocksdb,bbiao/rocksdb,ryneli/rocksdb,ryneli/rocksdb,bbiao/rocksdb,ryneli/rocksdb,SunguckLee/RocksDB,OverlordQ/rocksdb,wenduo/rocksdb,facebook/rocksdb,Andymic/rocksdb,OverlordQ/rocksdb,Andymic/rocksdb,flabby/rocksdb,flabby/rocksdb,ryneli/rocksdb,jalexanderqed/rocksdb,hobinyoon/rocksdb,tsheasha/rocksdb,wat-ze-hex/rocksdb,OverlordQ/rocksdb,vmx/rocksdb,vmx/rocksdb,bbiao/rocksdb,SunguckLee/RocksDB,flabby/rocksdb,OverlordQ/rocksdb,facebook/rocksdb,wat-ze-hex/rocksdb,facebook/rocksdb,wat-ze-hex/rocksdb,vmx/rocksdb,Vaisman/rocksdb,flabby/rocksdb,norton/rocksdb,wenduo/rocksdb,tsheasha/rocksdb,Andymic/rocksdb,tsheasha/rocksdb,hobinyoon/rocksdb,Vaisman/rocksdb,hobinyoon/rocksdb,wenduo/rocksdb,OverlordQ/rocksdb,wenduo/rocksdb,ryneli/rocksdb,bbiao/rocksdb,SunguckLee/RocksDB,wat-ze-hex/rocksdb,tsheasha/rocksdb,tsheasha/rocksdb,jalexanderqed/rocksdb,flabby/rocksdb,norton/rocksdb,Vaisman/rocksdb,Andymic/rocksdb,tsheasha/rocksdb,jalexanderqed/rocksdb,norton/rocksdb,vmx/rocksdb,OverlordQ/rocksdb,facebook/rocksdb,facebook/rocksdb,flabby/rocksdb,wat-ze-hex/rocksdb,ryneli/rocksdb,vmx/rocksdb,Vaisman/rocksdb,flabby/rocksdb,SunguckLee/RocksDB,norton/rocksdb,norton/rocksdb,wat-ze-hex/rocksdb,bbiao/rocksdb,SunguckLee/RocksDB,wenduo/rocksdb,jalexanderqed/rocksdb,jalexanderqed/rocksdb,norton/rocksdb,Andymic/rocksdb,vmx/rocksdb,SunguckLee/RocksDB,vmx/rocksdb,norton/rocksdb,hobinyoon/rocksdb,SunguckLee/RocksDB,SunguckLee/RocksDB,wat-ze-hex/rocksdb,hobinyoon/rocksdb,bbiao/rocksdb,hobinyoon/rocksdb,hobinyoon/rocksdb,Andymic/rocksdb,tsheasha/rocksdb,facebook/rocksdb,wenduo/rocksdb,tsheasha/rocksdb,hobinyoon/rocksdb,jalexanderqed/rocksdb,norton/rocksdb,facebook/rocksdb,wenduo/rocksdb,wat-ze-hex/rocksdb