Fix php cs issues

Signed-off-by: Julius Härtl <jus@bitgrid.net>

tests/unit/Db/AttachmentTest.php

@@ -18,7 +18,7 @@
  *
  * You should have received a copy of the GNU Affero General Public License
  * along with this program. If not, see <http://www.gnu.org/licenses/>.
- *  
+ *
  */
 
 namespace OCA\Deck\Db;
@@ -48,4 +48,4 @@ class AttachmentTest extends \Test\TestCase {
 
 		], $board->jsonSerialize());
 	}
-}
+}