Fix testpackage-appstream: XDG_DATA_DIRS needs to be explicitly extended
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Authored by kossebau on Apr 21 2020, 4:35 PM.

Description

Fix testpackage-appstream: XDG_DATA_DIRS needs to be explicitly extended

Summary:
Setting XDG_DATA_DIRS in the ENVIRONMENT property using
"XDG_DATA_DIRS=/path:$XDG_DATA_DIRS" has two flaws

the value string is not evaluated e.g. by a shell but set directly, so $XDG_DATA_DIRS will stay verbatim
if XDG_DATA_DIRS was not set before, setting it now will trigger the rules to use the default /usr/local/share & /usr/share only if XDG_DATA_DIRS is not set, thus effectively removing these dirs now

Reviewers: Frameworks, mart, apol, sitter, bcooksley

Reviewed By: apol

Subscribers: kde-frameworks-devel