tests: Fix FL_CACHE_DIR when system helper is compiled out

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The tests assumed that a system installation always uses the XDG cache
location unless running as root. However, Flatpak only uses that cache
location when the system helper is available at both compile and run
time. [1]

Builds configured with -Dsystem_helper=disabled instead use the
repo-local cache directory [2], causing the tests to look for cached
summaries in the wrong location and fail.

[1]: https://github.com/flatpak/flatpak/blob/96ad6825f3e7115eb95abeba55600b2a39b71178/common/flatpak-dir.c#L4853-L4862
[2]: https://github.com/flatpak/flatpak/blob/96ad6825f3e7115eb95abeba55600b2a39b71178/common/flatpak-dir.c#L4942-L4943

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