funder_policy: set default to 0

As we move to advertising liquidity, set the default to not have any
fuzz. This means we won't randomly reject an offer to buy liquidity.

plugins/funder_policy.c

@@ -86,7 +86,7 @@ default_funder_policy(const tal_t *ctx,
 				 AMOUNT_SAT(UINT_MAX),
 				 AMOUNT_SAT(10000),
 				 AMOUNT_SAT(UINT_MAX),
-				 5, 		/* fuzz_factor */
+				 0, 		/* fuzz_factor */
 				 AMOUNT_SAT(0), /* reserve_tank */
 				 100);
 }

tests/test_opening.py

@@ -1000,7 +1000,7 @@ def test_funder_options(node_factory, bitcoind):
     assert funder_opts['per_channel_min'] == '10000000msat'
     assert funder_opts['per_channel_max'] == '4294967295000msat'
     assert funder_opts['reserve_tank'] == '0msat'
-    assert funder_opts['fuzz_percent'] == 5
+    assert funder_opts['fuzz_percent'] == 0
     assert funder_opts['fund_probability'] == 100
 
     # l2 funds a chanenl with us. We don't contribute