Don't recheck terminal type for color (#11412)

Not necessary as it's checked further up the call tree. Without this --log.color doesn't work when intended.

op-service/log/cli.go

@@ -140,7 +140,7 @@ func FormatHandler(ft FormatType, color bool) func(io.Writer) slog.Handler {
 	case FormatJSON:
 		return log.JSONHandler
 	case FormatText:
-		if term.IsTerminal(int(os.Stdout.Fd())) {
+		if color {
 			return termColorHandler
 		} else {
 			return logfmtHandler