[TASK] Replace icon for open in new window

Task Center Module: Open in new window:
use icon utility > sprite monochrome, vector icon

Resolves: #63259
Releases: master
Change-Id: Idb99858591e4ccca6fb835688462252832aa53a3
Reviewed-on: http://review.typo3.org/34533
Reviewed-by: Benjamin Mack <benni@typo3.org>
Tested-by: Benjamin Mack <benni@typo3.org>