Refs #4739, remove unneeded persist_fixture_data.

config/global.ini.php

@@ -86,11 +86,6 @@
 ; Allow automatic upgrades to Beta or RC releases
 allow_upgrades_to_beta = 0
 
-[Tests]
-; Whether to save fixture data in separate databases when running tests. if you run tests often, this means
-; you don't have to re-run the test fixture setup each time you re-run a test. (only applicable for UI tests)
-persist_fixture_data = 0
-
 [General]
 ; the following settings control whether Unique Visitors will be processed for different period types.
 ; year and range periods are disabled by default, to ensure optimal performance for high traffic Piwik instances