[BUGFIX] Ensure correct URL generation with http_build_query()

http_build_query() internally uses the PHP setting arg-separator.output
to identify the URL parameter separator.
This does not seem appropriate for URLs generated by TYPO3.

Use the optional parameters of http_build_query() to get the desired
functionality.

Releases: master, 8.7, 7.6
Resolves: #81366
Change-Id: Ie2df9207b1967257d6327ff1103503e6a58d5cdf
Reviewed-on: https://review.typo3.org/52964


Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>