mxgrub: Default to ttyS0 for serial console

mxgrub/mxgrub

@@ -240,7 +240,7 @@ sub scan_mariux {
 	}
 }
 
-our $KERNEL_PARAMETER="ro crashkernel=256M console=ttyS1,115200n8 console=tty0 init=/bin/systemd audit=0 random.trust_cpu=on";
+our $KERNEL_PARAMETER="ro crashkernel=256M console=ttyS0,115200n8 console=tty0 init=/bin/systemd audit=0 random.trust_cpu=on";
 
 sub update_grub_cfg {
 	my $kernellist='';