Fix a type issue in the outgoing_payments_for_payment_hash query

Author: jklein24

lightspark/scripts/outgoing_payments_for_payment_hash.py

@@ -4,7 +4,7 @@
 
 OUTGOING_PAYMENTS_FOR_PAYMENT_HASH_QUERY = f"""
 query OutgoingPaymentsForPaymentHash(
-    $payment_hash: String!,
+    $payment_hash: Hash32!,
     $transaction_statuses: [TransactionStatus!] = null
 ) {{
     outgoing_payments_for_payment_hash(input: {{