cmd: let "isolate off" put the top port back in the member list

The member mask is filled with a loop that stops one short, so the
highest front panel port never gets its bit and stays isolated from the
port that was just opened up. Every other loop over the port range in
the tree treats machine.max_port as the last port rather than the one
past it.

cmd_parser.c

@@ -573,7 +573,7 @@ void parse_isolate(void)
     }
 
 	if (cmd_compare(2, "off")) {
-		for (uint8_t i = machine.min_port; i < machine.max_port; i++)
+		for (uint8_t i = machine.min_port; i <= machine.max_port; i++)
 			members |= ((uint16_t)1) << i;
 		members |= 0x200; // CPU-port
 		port_isolate(port_configured, members);