lib/apache2: Update location to wsgi python script

lib/apache2: Update location to wsgi python script

Commit 8fe68d96f18e ("wsgi: Move wsgi file to expected location")
relocated lib/apache2/patchwork.wsgi to patchwork/wsgi.py but did not
update the Apache2 example configuration file under
lib/apache2/patchwork.wsgi.conf.

Fixes: 8fe68d96f18e ("wsgi: Move wsgi file to expected location")
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Reviewed-by: Stephen Finucane <stephen@that.guru>
(cherry picked from commit 114ff6061d4005b2458e75da52f3a6cf4ae19bf5)