UI: Fix small bug with the multi-selection button (#591)

This bug was introduced in 081b09207f2247d7e38fc28e0f0f9748eecbbcbe.

client/components/boards/boardHeader.jade

@@ -89,7 +89,7 @@ template(name="boardHeaderBar")
           span {{#if MultiSelection.isActive}}{{_ 'multi-selection-on'}}{{else}}{{_ 'multi-selection'}}{{/if}}
           if MultiSelection.isActive
             a.board-header-btn-close.js-multiselection-reset(title="{{_ 'filter-clear'}}")
-            i.fa.fa-times-thin
+              i.fa.fa-times-thin
 
       .separator
       a.board-header-btn.js-open-board-menu