Use local paths for image tests in EXT:install to avoid
problems with PHP allow_url_fopen configuration.
The "data://" wrapper requires a allow_url_fopen=1
configuration.

Resolves: #78117
Releases: master, 8.7
Change-Id: I7b022dc7681f6e2d3344525e624575be7e6037e9
Reviewed-on: https://review.typo3.org/55300


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Markus Klein <markus.klein@typo3.org>
Tested-by: Markus Klein <markus.klein@typo3.org>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Reviewed-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Tested-by: Andreas Fernandez <a.fernandez@scripting-base.de>