Fix updating bitasset's minimum number of feeds
Fix updating bitasset's minimum number of feeds

BitSharesEurope/graphene-ui-testnet,BitSharesEurope/wallet.bitshares.eu,bitshares/bitshares-ui,bitshares/bitshares-2-ui,BitSharesEurope/testnet.bitshares.eu,BitSharesEurope/testnet.bitshares.eu,bitshares/bitshares-ui,BitSharesEurope/wallet.bitshares.eu,BitSharesEurope/graphene-ui-testnet,bitshares/bitshares-2-ui,BitSharesEurope/wallet.bitshares.eu,bitshares/bitshares-2-ui,BitSharesEurope/graphene-ui-testnet,BitSharesEurope/wallet.bitshares.eu,BitSharesEurope/testnet.bitshares.eu,bitshares/bitshares-ui,BitSharesEurope/graphene-ui-testnet,bitshares/bitshares-ui,BitSharesEurope/testnet.bitshares.eu