This function was important when token balances were stored as JSON BigNumber in localforage and had to be parsed back to BN objects.With D15256 landed, we can no longer pass `isValidStoredWallet` with the type of wallet that would benefit from the limited migration implemented in the confusingly named `loadStoredWallet` function
At this point, there should be very few stored wallets that are stillDelete this old and unmigratedfunction. For those that still existIf Cashtab loads with an invalid wallet, catch them with a validation checit will populate wallet state from chronik and load them from API instead of maintaining this customized methodnot by modifying params in the local storage object.