fix: a pr2444 introduced valgrind complaint

This will add the testnet config copyNpaste to test_utils.c,
so that the test stups can set these.

Alternatively, to reduce code duplication, we can move the
testnet_config and mainnet_config from options.c to options.h.

wallet/test/test_utils.c

@@ -0,0 +1,25 @@
+#include "test_utils.h"
+
+/*
+ * Copy of lightnind/options.c testnet_config
+ * To reduce code duplication move testnet_config from options.c to options.h.
+ */
+const struct config test_config = {
+	.locktime_blocks = 6,
+	.locktime_max = 14 * 24 * 6,
+	.anchor_confirms = 1,
+	.commitment_fee_min_percent = 0,
+	.commitment_fee_max_percent = 0,
+	.commitment_fee_percent = 500,
+	.cltv_expiry_delta = 6,
+	.cltv_final = 10,
+	.commit_time_ms = 10,
+	.fee_base = 1,
+	.fee_per_satoshi = 10,
+	.broadcast_interval_msec = 60000,
+	.channel_update_interval = 1209600/2,
+	.ignore_fee_limits = true,
+	.rescan = 30,
+	.max_fee_multiplier = 10,
+	.use_dns = true,
+};