Wallets on three different simulators show different amounts.

All three simulators are watching `0x73bceb1cd57c711feac4224d062b0f6ff338501e`. I erased the app before installing and running AlphaWallet. This is the only wallet it is watching. Different iOS versions appear to report different figures. The simulators running 15.2 are in somewhat "close" agreement while the simulator running 14.5 is quite different. Running master / d5565b90.