Trivial error in uptime display

[ebcdic]

The uptime in the dashboard may be displayed as something like "14 Days 19 Hours 1 Minute 45 Second" (instead of "45 Seconds"). This is because it tests the minutes rather than the seconds to decide whether to used the plural.

The error is in functions.inc.php which has

    if ($upmins > 1) {
            $seconds = "s";

[stephenw10]

Thanks: https://redmine.pfsense.org/issues/14176