Tests: Fix bash_completion.t problem
Tests: Fix bash_completion.t problem

- bash_completion.t rewrites task.sh during setup in order to be able
  to test it.  704eb1eab3a63fa5df6fcbf91a5eead78f30418d broke that
  rewrite mechanism.

tbabej/task,tbabej/task,tbabej/task,tbabej/task,tbabej/task