[BUGFIX] Invalid file identifier with GIFBUILDER

Reference to the original file is missing.

Resolves: #62184
Releases: master, 6.2
Change-Id: I0e8e9ced11c37544baee2ca40d4da647e12d485b
Reviewed-on: http://review.typo3.org/37158


Reviewed-by: Markus Klein <klein.t3@reelworx.at>
Tested-by: Markus Klein <klein.t3@reelworx.at>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Stephan Großberndt <stephan@grossberndt.de>
Reviewed-by: Nicole Cordes <typo3@cordes.co>
Tested-by: Nicole Cordes <typo3@cordes.co>
Reviewed-by: Xavier Perseguers <xavier@typo3.org>
Tested-by: Xavier Perseguers <xavier@typo3.org>