[Applications] Fix: json response of detail view is empty
[Applications]: Fix: List param "applyId" does not show applications.

Problem:
  If an applyId is passed to the applications list, no applications are displayed,
  even if there are applications associated with the job.

Cause:
  ParamsToPropertiesFilter adds the current users' id to the db query, if no
  "by"-Param is present.

Solution:
  If an applyId is passed in, ParamsToPropertiesFilter will add the param "by"
  with value "jobs", if it is not set.