t: adjust error message when bank doesn't exist

Problem: There is a test in t1023-flux-account-banks.t that looks for a
specific error message when trying to view a bank that does not exist,
but this error message has changed slightly with the introduction of
the BankFormatter subclass.

Change the expected error message in t1023-flux-account-banks.t to
account for the new message format.

t/t1023-flux-account-banks.t

@@ -45,7 +45,7 @@ test_expect_success 'add some queues' '
 
 test_expect_success 'trying to view a bank that does not exist in the DB should raise a ValueError' '
 	test_must_fail flux account view-bank foo > bank_nonexistent.out 2>&1 &&
-	grep "bank foo not found in bank_table" bank_nonexistent.out
+	grep "error in view-bank: view-bank: no results found in query" bank_nonexistent.out
 '
 
 test_expect_success 'viewing the root bank with no optional args should show basic bank info' '