fiuxp! allow larger trigger/recovery output amounts

Allow trigger/recovery output nValues to exceed the amounts supplied by
constituent vault inputs. This allows future compatibility for e.g.
trigger collateral.

Author: jamesob

bip-0345.mediawiki

@@ -351,7 +351,9 @@ def validate_deferred_checks(checks: [DeferredCheck], tx: Transaction) -> bool:
             out_map[c.vout_idx] += c.input_amount
 
     for (vout_idx, amount_sats) in out_map.items():
-        if tx.vout[vout_idx].nValue != amount_sats:
+        # Trigger/recovery value can be greater than the constituent vault input
+        # amounts.
+        if tx.vout[vout_idx].nValue < amount_sats:
             return False
 
     return True