Expect no_utxos_available instead of not_enough_money. (#4374)

## Summary

This PR attempts to fix the end-to-end tests.

## Details

If the wallet is asked to create a transaction in a situation where
there are no UTxOs available, then the wallet will return a
`no_utxos_available` error instead of a `not_enough_money` error.

See:
- #4366
-
https://github.com/cardano-foundation/cardano-wallet/actions/runs/7294574003/job/19879662240#step:12:906

## Issue

ADP-3248

test/e2e/spec/e2e_spec.rb

@@ -2877,7 +2877,7 @@ def script_hash
         pools = SHELLEY.stake_pools
         fees = pools.delegation_fees(id)
         expect(fees).to be_correct_and_respond 403
-        expect(fees.to_s).to include 'not_enough_money'
+        expect(fees.to_s).to include 'no_utxos_available'
       end
 
       it 'I could join Stake Pool - if I had enough to cover fee' do
@@ -2887,7 +2887,7 @@ def script_hash
 
         join = pools.join(pool_id, id, PASS)
         expect(join).to be_correct_and_respond 403
-        expect(join.to_s).to include 'not_enough_money'
+        expect(join.to_s).to include 'no_utxos_available'
       end
 
       it 'Can list stake pools only when stake is provided' do