wallet: Use `struct sha256` for payment_hash in `struct forwarding`

lightningd/notification.c

@@ -120,8 +120,7 @@ void notify_forward_event(struct lightningd *ld,
 		cur->msat_out = AMOUNT_MSAT(0);
 		cur->fee = AMOUNT_MSAT(0);
 	}
-	cur->payment_hash = tal(cur, struct sha256_double);
-	cur->payment_hash->sha = in->payment_hash;
+	cur->payment_hash = tal_dup(cur, struct sha256, &in->payment_hash);
 	cur->status = state;
 	cur->failcode = failcode;
 	cur->received_time = in->received_time;

wallet/wallet.c

@@ -2851,8 +2851,8 @@ const struct forwarding *wallet_forwarded_payments_get(struct wallet *w,
 		}
 
 		if (sqlite3_column_type(stmt, 3) != SQLITE_NULL) {
-			cur->payment_hash = tal(ctx, struct sha256_double);
-			sqlite3_column_sha256_double(stmt, 3, cur->payment_hash);
+			cur->payment_hash = tal(ctx, struct sha256);
+			sqlite3_column_sha256(stmt, 3, cur->payment_hash);
 		} else {
 			cur->payment_hash = NULL;
 		}

wallet/wallet.h

@@ -190,7 +190,7 @@ static inline const char* forward_status_name(enum forward_status status)
 struct forwarding {
 	struct short_channel_id channel_in, channel_out;
 	struct amount_msat msat_in, msat_out, fee;
-	struct sha256_double *payment_hash;
+	struct sha256 *payment_hash;
 	enum forward_status status;
 	enum onion_type failcode;
 	struct timeabs received_time;