Update show_sys_state.php to display current kernel info for stable-3.1 in relation to recently merged commits of https://git.ispconfig.org/ispconfig/ispconfig3/merge_requests/790 and https://git.ispconfig.org/ispconfig/ispconfig3/merge_requests/791.

There is a fix to the filename for master submitted via commit https://git.ispconfig.org/ispconfig/ispconfig3/merge_requests/804 that is still pending.

Author: ahrasis