internal/debug: remove unnecessary log level assignment (#30044)

Log level is specified in L259 so it's unnecessary to specify it for handlers (L234, L236).

internal/debug/flags.go

@@ -231,9 +231,9 @@ func Setup(ctx *cli.Context) error {
 	case ctx.Bool(logjsonFlag.Name):
 		// Retain backwards compatibility with `--log.json` flag if `--log.format` not set
 		defer log.Warn("The flag '--log.json' is deprecated, please use '--log.format=json' instead")
-		handler = log.JSONHandlerWithLevel(output, log.LevelInfo)
+		handler = log.JSONHandler(output)
 	case logFmtFlag == "json":
-		handler = log.JSONHandlerWithLevel(output, log.LevelInfo)
+		handler = log.JSONHandler(output)
 	case logFmtFlag == "logfmt":
 		handler = log.LogfmtHandler(output)
 	case logFmtFlag == "", logFmtFlag == "terminal":