[ticket/12707] Do not try to load 3.1 DBMS driver name as 3.0 driver.

PHPBB3-12707
Merge pull request #2590 from bantu/ticket/12707

[ticket/12707] Do not try to load 3.1 DBMS driver name as 3.0 driver.

* bantu/ticket/12707:
  [ticket/12707] Do not try to load 3.1 DBMS driver name as 3.0 driver.