Fix highlight of signals in ship list and force formatting same as summary

Author: abeverley

ADBOS/Display.pm

@@ -337,7 +337,7 @@ sub ship($$$)
           all    => $all,
           user   => $user,
           tasks  => \@tasks,
-          period => ($period // 1),
+          period => ($period || 1),
           title  => $title
         };
 

templates/ships.html

@@ -32,7 +32,7 @@ <h1>[% ship.name | html_entity %]</h1>
   <p>Showing only extant and recently rectified OPDEFs. (<a href="?all=1">Show
   all OPDEFs</a>.)</p>
   [% END %]
-  <table>
+  <table class="opdeflist">
   [% FOREACH opdef IN opdefs %]
 
     [% IF opdef.modified.epoch > time - 86400 * period %]