Fix arguments for hevercardable helper

We should pass person object to the hovecrardable helper. In the
current case `this` is the status message, not the status
author. So, let's pass `author` instead of `this`.

app/assets/templates/reshare_tpl.jst.hbs

@@ -13,7 +13,7 @@
       {{#with root}}
         <div class="bd">
           <div>
-            <a href="/people/{{author.guid}}" class="author {{{hovercardable this}}}">{{author.name}}</a>
+            <a href="/people/{{author.guid}}" class="author {{{hovercardable author}}}">{{author.name}}</a>
 
             <span class="details grey">
               -