Revert "PythonTest_dbaccess_python: don't modify source document"

This reverts commit 29474c7a.

Removing the lock file fails on Windows because it is opened; it ought
be possible to close the document instead to clean up the lock file?

Change-Id: I2c93fc893c62d6a267be9723761e5ed7577086a7

dbaccess/qa/python/fdo84315.py

@@ -7,10 +7,8 @@
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 #
 
-import os
 import unittest
 from collections import deque
-import unohelper
 from org.libreoffice.unotest import UnoInProcess
 
 class Fdo84315(unittest.TestCase):
@@ -25,10 +23,7 @@ class Fdo84315(unittest.TestCase):
 
     @classmethod
     def tearDownClass(cls):
-        # Closing the connection properly would modify the source document for some reason.
-        lock = unohelper.fileUrlToSystemPath(cls._xDoc.URL) + ".lck"
         cls._uno.tearDown()
-        os.remove(lock)
 
     def test_fdo84315(self):
         xDoc = self.__class__._xDoc