Duplicate wallet creation in non-persistent path

[Mshehu5]

Describe the bug

Location: src/handlers.rs:1000-1008 (in #[cfg(not(any(feature = "sqlite", feature = "redb")))] block)

Problem:
Wallet created twice:

1. Line 1002: let wallet = new_wallet(...) (immutable)
2. Line 1005: let mut wallet = new_wallet(...) (mutable, shadows first)
   blockchain_client is created with the first wallet, then the second wallet is used with that client, causing a mismatch.

Expected behavior

Should only use one wallet this affects builds without sqlite/redb features. May cause incorrect wallet state.

Remove line 1005 and add mut to wallet creation on 1002

[tvpeter]

fixed by #233