WebSearch: fix browsing deleted/restricted records

• Amends the browse_pattern functionality such that deleted and restricted records are no longer included in the results unless their collection is explicitly defined. (Only for restricted records and authorized users.) (closes #1292)

Co-authored-by: Jerome Caffaro <jerome.caffaro@cern.ch>
Reviewed-by: Tibor Simko <tibor.simko@cern.ch>