Fix import pages URLs

client/components/boards/boardHeader.jade

@@ -202,9 +202,9 @@ template(name="createBoard")
 template(name="chooseBoardSource")
   ul.pop-over-list
     li
-      a(href="{{pathFor 'import/trello'}}") {{_ 'from-trello'}}
+      a(href="{{pathFor '/import/trello'}}") {{_ 'from-trello'}}
     li
-      a(href="{{pathFor 'import/wekan'}}") {{_ 'from-wekan'}}
+      a(href="{{pathFor '/import/wekan'}}") {{_ 'from-wekan'}}
 
 template(name="boardChangeTitlePopup")
   form