Don't show same collection twice in list of "Recently created collections".

Fix #77

Author: php-coder

src/main/resources/sql/collection_dao_queries.properties

@@ -1,5 +1,5 @@
-  SELECT c.id AS collection_id \
 collection.find_last_created = \
+  SELECT DISTINCT c.id AS collection_id \
        , c.slug AS collection_slug \
        , u.name AS owner_name \
     FROM collections_series cs \