Bug 25019: Make the ViewPolicy filter initialization standard

Bug 25019: Make the ViewPolicy filter initialization standard

This patch makes the ViewPolicy filter use the 'params' accessor instead
of relying of ->{options} which has no accessor. This will allow
interacting with the filter object be similar through all the filters in
the chain.

To test, we just need to verify no behaviour change takes place:
1. Run:
   $ kshell
  k$ prove t/db_dependent/Filter_MARC_ViewPolicy.t
=> SUCCESS: Tests pass
2. Apply this patch
3. Repeat 1
=> SUCCESS: Tests still pass!
4. Sign off :-D

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Joy Nelson <joy@bywatersolutions.com>
(cherry picked from commit e6c829d887b8b6aeda98a7ba57dc9ac04b79a7a3)

Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>