fix: center aligned infinity loader spinner on public speaker page (#3995)

Author: snitin315

app/templates/public/speakers.hbs

@@ -4,11 +4,11 @@
       {{public/speaker-item speaker=speaker}}
     </div>
   {{/each}}
-  {{#infinity-loader infinityModel=model}}
-    <div class="center aligned five wide column">
+  <div class="sixteen wide column">
+    {{#infinity-loader infinityModel=model}}
       <div class="ui loading very padded basic segment">
       </div>
-    </div>
-    {{infintyModel.reachedInfinity}}
-  {{/infinity-loader}}
+      {{infintyModel.reachedInfinity}}
+    {{/infinity-loader}}
+  </div>
 </div>