templates: fix wiki icons (switch edit/create)

src/templates/slim/html5/_tools.html.slim

@@ -1,5 +1,5 @@
 #toolbar
   a href=wiki_link_edit()
-    i class="fa fa-plus-square" aria-hidden="true"
-  a href=wiki_link_create()
     i class="fa fa-pencil-square" aria-hidden="true"
+  a href=wiki_link_create()
+    i class="fa fa-plus-square" aria-hidden="true"