[ticket/12818] Deleting a log entry in MCP produces a General error

https://tracker.phpbb.com/browse/PHPBB3-12818

PHPBB3-12818
1) phpbb_functional_mcp_test::test_delete_logs
Failed asserting that actual size 5 matches expected size 1.
/home/travis/build/phpbb/phpbb/tests/functional/mcp_test.php:72

assertGreaterThanEquals (or what the name was)