Update specifyweb.wsgi to ensure application current work directory be the project directory

[jobdiogenes]

Change wsgi file to ensure the application current work directory is the directory of this wsgi file

Fixes #
some file not found error wich could occur in some environments

Checklist

• [ x] Self-review the PR after opening it to make sure the changes look good
  and self-explanatory (or properly documented)
• Add automated tests
• Add relevant issue to release milestone

Testing instructions