CUSTESC-33731: Make rule match test report rule in 0-index base

This changes guarantees that the coommand to report rule matches when
testing local config reports the rule number using the 0-based indexing.
This is to be consistent with the 0-based indexing on the log lines when
proxying requests.

cmd/cloudflared/tunnel/ingress_subcommands.go

@@ -139,7 +139,7 @@ func testURLCommand(c *cli.Context) error {
 	}
 
 	_, i := ing.FindMatchingRule(requestURL.Hostname(), requestURL.Path)
-	fmt.Printf("Matched rule #%d\n", i+1)
+	fmt.Printf("Matched rule #%d\n", i)
 	fmt.Println(ing.Rules[i].MultiLineString())
 	return nil
 }