tests: Run appinfo tests with a temporary XDG_CONFIG_HOME

Merged Philip Withnall requested to merge pwithnall/glib:1514-appinfo-test-failure into master

Otherwise they fill your real ~/.config/mimeapps.list with rubbish and race for access to it. This is arguably not good.

Signed-off-by: Philip Withnall withnall@endlessm.com

#1514 (closed)

Closes #1514 (closed)

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