fix(vault tests): add ensure account

[teddyjfpender]

Describe changes

Fixing tests that are failing.

Previously the @palladxyz/vault test for Accounts was failing with the following error:

TypeError: Cannot read properties of undefined (reading 'B62qjsV6WQwTeEWrNrRRBP6VaaLvQhwWTnFi4WP4LQjGvpfZEumXzxb')
 ❯ src/account/accountStore.ts:35:36
     33|       produce((state) => {
     34|         state.accounts[network][address] = {
     35|           ...state.accounts[network][address],
       |                                    ^
     36|           accountInfo
     37|         }

A quick fix using ensureAccount solves this. However further discussion is needed to define whether this is the best solution.

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