Fix style in src/unittest/btree_whole.cc
Fix style in src/unittest/btree_whole.cc

Introduced when the code was added in:
e9025ef Add whole btree fuzzing unit tests

dparnell/rethinkdb,niieani/rethinkdb,robertjpayne/rethinkdb,catroot/rethinkdb,jmptrader/rethinkdb,eliangidoni/rethinkdb,niieani/rethinkdb,jmptrader/rethinkdb,bchavez/rethinkdb,catroot/rethinkdb,jmptrader/rethinkdb,bpradipt/rethinkdb,mbroadst/rethinkdb,eliangidoni/rethinkdb,niieani/rethinkdb,mbroadst/rethinkdb,niieani/rethinkdb,mbroadst/rethinkdb,bchavez/rethinkdb,jmptrader/rethinkdb,eliangidoni/rethinkdb,bpradipt/rethinkdb,bchavez/rethinkdb,eliangidoni/rethinkdb,JackieXie168/rethinkdb,JackieXie168/rethinkdb,JackieXie168/rethinkdb,grandquista/rethinkdb,bchavez/rethinkdb,mbroadst/rethinkdb,jmptrader/rethinkdb,jmptrader/rethinkdb,catroot/rethinkdb,robertjpayne/rethinkdb,dparnell/rethinkdb,mbroadst/rethinkdb,Qinusty/rethinkdb,JackieXie168/rethinkdb,Qinusty/rethinkdb,JackieXie168/rethinkdb,Qinusty/rethinkdb,grandquista/rethinkdb,grandquista/rethinkdb,dparnell/rethinkdb,JackieXie168/rethinkdb,dparnell/rethinkdb,catroot/rethinkdb,Qinusty/rethinkdb,mbroadst/rethinkdb,jmptrader/rethinkdb,robertjpayne/rethinkdb,Qinusty/rethinkdb,bpradipt/rethinkdb,Qinusty/rethinkdb,dparnell/rethinkdb,eliangidoni/rethinkdb,niieani/rethinkdb,niieani/rethinkdb,dparnell/rethinkdb,grandquista/rethinkdb,robertjpayne/rethinkdb,dparnell/rethinkdb,grandquista/rethinkdb,eliangidoni/rethinkdb,catroot/rethinkdb,Qinusty/rethinkdb,bchavez/rethinkdb,JackieXie168/rethinkdb,robertjpayne/rethinkdb,grandquista/rethinkdb,dparnell/rethinkdb,bpradipt/rethinkdb,bchavez/rethinkdb,bchavez/rethinkdb,eliangidoni/rethinkdb,Qinusty/rethinkdb,grandquista/rethinkdb,niieani/rethinkdb,jmptrader/rethinkdb,niieani/rethinkdb,bchavez/rethinkdb,mbroadst/rethinkdb,grandquista/rethinkdb,catroot/rethinkdb,bpradipt/rethinkdb,grandquista/rethinkdb,bpradipt/rethinkdb,bpradipt/rethinkdb,eliangidoni/rethinkdb,mbroadst/rethinkdb,catroot/rethinkdb,bchavez/rethinkdb,robertjpayne/rethinkdb,JackieXie168/rethinkdb,mbroadst/rethinkdb,robertjpayne/rethinkdb,bpradipt/rethinkdb,dparnell/rethinkdb,catroot/rethinkdb,JackieXie168/rethinkdb,robertjpayne/rethinkdb,robertjpayne/rethinkdb,bpradipt/rethinkdb,eliangidoni/rethinkdb,Qinusty/rethinkdb