[BUGFIX] Wrong icon in db_new tree

The wrong line icon is used in the wizard of
db_new.php

Change-Id: Ifba1d0270b547e11326ffb1c82a48e8c8838b401
Resolves: #40862
Releases: 6.0
Reviewed-on: http://review.typo3.org/14545
Reviewed-by: Wouter Wolters
Tested-by: Wouter Wolters
Reviewed-by: Christian Kuhn
Tested-by: Christian Kuhn