LW: Partial #1407: Allow transfer of UIA with BTS fee
LW: Partial #1407: Allow transfer of UIA with BTS fee

Fixes an issue in the light wallet which failed to detect a BTS
balance capable of paying a UIA transfer fee.

dacsunlimited/dac_play,bitshares/bitshares-0.x,bitshares/bitshares-0.x,frrp/bitshares,FollowMyVote/bitshares,bitshares/devshares,camponez/bitshares,bitsuperlab/cpp-play,FollowMyVote/bitshares,dacsunlimited/dac_play,frrp/bitshares,bitshares/bitshares,dacsunlimited/dac_play,bitshares/bitshares,bitsuperlab/cpp-play,frrp/bitshares,bitshares/devshares,camponez/bitshares,FollowMyVote/bitshares,frrp/bitshares,jakeporter/Bitshares,jakeporter/Bitshares,bitsuperlab/cpp-play,bitshares/bitshares-0.x,bitshares/devshares,bitshares/bitshares-0.x,camponez/bitshares,jakeporter/Bitshares,dacsunlimited/dac_play,bitsuperlab/cpp-play,bitsuperlab/cpp-play,bitshares/devshares,frrp/bitshares,jakeporter/Bitshares,camponez/bitshares,FollowMyVote/bitshares,FollowMyVote/bitshares,bitsuperlab/cpp-play,jakeporter/Bitshares,dacsunlimited/dac_play,jakeporter/Bitshares,bitshares/bitshares,dacsunlimited/dac_play,camponez/bitshares,bitshares/devshares,bitshares/bitshares-0.x,bitshares/devshares,bitshares/bitshares,bitshares/bitshares,bitshares/bitshares,bitshares/bitshares-0.x,frrp/bitshares,camponez/bitshares,FollowMyVote/bitshares