Bug 13499: Tidy of Auth.pm

Bug 13499: Tidy of Auth.pm

This tidy should only change whitespace and not line breaks, thus
retaining history.

There are no code changes, and thus there should be no regressions to
test for koha wise.

To test the non-destrcutive nature of the patch, run a 'git blame -w' on
the file before and after the patch. The resulting blame should include
a comparabile history of the file, with only some additional blank
lines being attributed to this commit.

A 'git blame -wM' may also be useful for comparison purposes.

Signed-off-by: Chris Cormack <chris@bigballofwax.co.nz>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>