Fix test_lib import

PEP 8: Optimize imports

tests/db_tests.py

@@ -25,15 +25,16 @@ Tests:
     DBMultiTests
 """
 
-import sys
 import os.path
-import unittest
+import sys
 import threading
-import tests.test_lib as test
+import unittest
 
 sys.path.insert(1, os.path.abspath(os.path.join(os.path.dirname(__file__), '../lib')))
 sys.path.insert(1, os.path.abspath(os.path.join(os.path.dirname(__file__), '..')))
 
+import tests.test_lib as test
+
 
 class DBBasicTests(test.SickbeardTestDBCase):
     """