BibSort: `last_updated` column name typo fix

* Fixes typo in column name `last_updated`.  (closes #1408) (PR #1742)

Signed-off-by: Ludmila Marian <ludmila.marian@gmail.com>
Reviewed-by: Tibor Simko <tibor.simko@cern.ch>
Merge branch 'maint-1.1'

* maint-1.1:
  BibSort: `last_updated` column name typo fix

Signed-off-by: Tibor Simko <tibor.simko@cern.ch>