route/rule: remove dead IgnoreDestinationIPCIDRMatch field

The field was never set to true after the legacy pre-match refactor
in 3549c02b8. Remove the declaration, guard check, and redundant
false assignments.

adapter/inbound.go

@@ -99,10 +99,9 @@ type InboundContext struct {
 
 	SourceAddressMatch           bool
 	SourcePortMatch              bool
-	DestinationAddressMatch      bool
-	DestinationPortMatch         bool
-	DidMatch                     bool
-	IgnoreDestinationIPCIDRMatch bool
+	DestinationAddressMatch bool
+	DestinationPortMatch    bool
+	DidMatch                bool
 }
 
 func (c *InboundContext) ResetRuleCache() {