run: propagate wildcard xauth entries to app bundle

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At the moment, flatpak applications are only given FamilyLocal family
xauth cookies from the Xauthority file.  This is so, the sandboxed
application doesn't inadvertently get access to displays on other
computers.

But FamilyLocal isn't the only xauth family that's local.  FamilyWild
entries can be local as well.

Furthermore, FamilyWild entries are preferable to FamilyLocal entries
when found, because they don't break if the system hostname is changed.

This commit makes FamilyWild xauth entries get propagated in the same
way as their FamilyLocal counterparts.

(cherry picked from commit a82708cb10)

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