Bug 13200 - Followup of Bug 12246 - noisy C4/Auth.pm

Bug 13200 - Followup of Bug 12246 - noisy C4/Auth.pm

While testing a bug, warnings in the opac error log were
building up due to a particular line in C4::Auth. After
reviewing the code, it was discovered that removal of the
OpacMainUserBlockMobile system preference created this.

Since the system preference no longer exists, and is not
used, the line was deleted from C4/Auth.pm to prevent this
warning from occuring.

TEST PLAN
----------
1) Go to any OPAC page.
2) Check your opac error log.
   -- there should be something about uninitialized values
      used in C4/Auth.pm around line 443.
3) Apply the patch
4) Refresh the page.
   -- that same error should not be triggered.
5) prove -v t/db_dependent/Auth.t
   -- this runs the get_template_and_user function
      which had the parameter removed.
6) run the koha qa test tools

Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>