The extension TS code can access localStorage directly

[bonomat]

In some cases we could access localStorage through the extension frontend (TS code) directly instead of going all the way through the wasm code. One particular example is load_loan_backup.

The issue here is that we would need to know the transaction id which is not available atm.

Originally posted by @thomaseizinger in https://github.com/comit-network/waves/pull/226#discussion_r687270743