[DRE-maint] Bug#952417: Fix importing issues due to using the wrong tmp directory

[Andre Heider]

Source: redmine
Version: 4.0.4-3~bpo10+1
Tags: patch

The debian package ships redmine in /usr/share/redmine and sets up
instances in /var/lib/redmine.

Without this change the issue importer attempts to create a directory in
the read-only /usr tree:
Completed 500 Internal Server Error
Errno::EACCES (Permission denied @ dir_s_mkdir - /usr/share/redmine/tmp):

Now it uses the intended tmp directory and issues can be imported again:
/var/lib/redmine/default/tmp/imports/350548aee641641463bc89cd6043738c
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