Fix imports for deleting history on Python 2

plexpy/database.py

@@ -14,6 +14,7 @@
 #  along with Tautulli.  If not, see <http://www.gnu.org/licenses/>.
 
 from __future__ import unicode_literals
+from future.builtins import str
 from future.builtins import object
 
 import arrow
@@ -25,8 +26,8 @@ import time
 
 import plexpy
 if plexpy.PYTHON2:
-    import helpers
     import logger
+    from helpers import cast_to_int
 else:
     from plexpy import logger
     from plexpy.helpers import cast_to_int