message: Remove isBroadcasting from top-level wallet state
  isBroadcasting is kept at the BroadcastTransactionStatus level, with a different state for each transaction.
diff: @@ -25,7 +25,6 @@ export const INITIAL_STATE: State = {
  inst: null,
  balance: null,
  tokens: {},
  - isBroadcasting: false,
  transactions: []
  };
  @@ -118,7 +117,6 @@ export function wallet(
  case 'WALLET_BROADCAST_TX_REQUESTED':
  return {
  ...state,
  - isBroadcasting: true,
  transactions: handleBroadcastTxRequested(state, action.payload.signedTx)
  };
  case 'WALLET_BROADCAST_TX_SUCCEEDED':
  