Uptime [HP-UX]: Remove leading zeroes

Variables with a leading 0 are treated as base-8, so it halts HP-UX
detection because of the error.

neofetch

@@ -403,6 +403,7 @@ get_uptime() {
                     d="0" h="0"
                     case "$t" in *"-"*) d="${t%%-*}"; t="${t#*-}";; esac
                     case "$t" in *":"*":"*) h="${t%%:*}"; t="${t#*:}";; esac
+                    h="${h#0}" t="${t#0}"
                     seconds="$((d*86400 + h*3600 + ${t%%:*}*60 + ${t#*:}))"
                 ;;
             esac