Bug 8311: Fix scoping error in C4::Auth

Bug 8311: Fix scoping error in C4::Auth

There is a mis-scoped function call in C4::Auth, on line 154, where
GetMembers is called without explicit scoping and before
'require C4::Members;'. This does not actually have any functional
ramifications as far as I can tell, but it would be a good idea to fix
it.

This patch also corrects a bit of indenting in that area, because it was
an unnecessary challenge to understand the code with the mis-indenting.

Signed-off-by: Marc Veron <veron@veron.ch>
Signed-off-by: Paul Poulain <paul.poulain@biblibre.com>