[BUGFIX] Do not reset the type configuration in the ext_tables

Resolves: #63050
Change-Id: Ic76b35d3577c9eb6cf385174e50a1497e43b2ed6
Reviewed-on: http://review.typo3.org/34308
Reviewed-by: Tim Lochmüller <tim@fruit-lab.de>
Tested-by: Tim Lochmüller <tim@fruit-lab.de>