Minor bugfix in market_engine
Minor bugfix in market_engine

The fee tally for fees paid in quote asset was declared as being base
asset, which caused an exception when a quote asset was added to it.

bitshares/bitshares,bitshares/bitshares-0.x,dacsunlimited/dac_play,dacsunlimited/dac_play,RemitaBit/Remitabit,frrp/bitshares,FollowMyVote/bitshares,bitsuperlab/cpp-play,camponez/bitshares,RemitaBit/Remitabit,bitshares/bitshares,jakeporter/Bitshares,camponez/bitshares,dacsunlimited/dac_play,dacsunlimited/dac_play,Ziftr/bitshares,FollowMyVote/bitshares,drltc/keyid,camponez/bitshares,camponez/bitshares,jakeporter/Bitshares,drltc/keyid,jakeporter/Bitshares,bitshares/bitshares,denkhaus/bitsharesx,bitshares/bitshares-0.x,bitshares/devshares,FollowMyVote/bitshares,frrp/bitshares,frrp/bitshares,denkhaus/bitsharesx,bitsuperlab/cpp-play,bitshares/bitshares,bitshares/devshares,dacsunlimited/dac_play,frrp/bitshares,denkhaus/bitsharesx,RemitaBit/Remitabit,RemitaBit/Remitabit,jakeporter/Bitshares,bitshares/bitshares-0.x,bitshares/devshares,Ziftr/bitshares,FollowMyVote/bitshares,jakeporter/Bitshares,bitshares/devshares,frrp/bitshares,Ziftr/bitshares,bitsuperlab/cpp-play,FollowMyVote/bitshares,Ziftr/bitshares,bitsuperlab/cpp-play,camponez/bitshares,drltc/keyid,bitshares/bitshares,bitshares/devshares,bitsuperlab/cpp-play,bitshares/bitshares-0.x,dacsunlimited/dac_play,RemitaBit/Remitabit,denkhaus/bitsharesx,jakeporter/Bitshares,bitshares/devshares,bitshares/bitshares-0.x,bitsuperlab/cpp-play,camponez/bitshares,RemitaBit/Remitabit,bitshares/bitshares-0.x,bitshares/bitshares,drltc/keyid,frrp/bitshares,FollowMyVote/bitshares