Fix broken case activity date filter

[colemanw]

Overview

Fixes datatable error when trying to filter case activities by date from the Case Summary screen.

Before

When selecting a "from" or "to" date in the activity filter, an error alert appears and no results are shown.

After

Date filters work correctly.

Notes

This removes 2 more deprecated jCalendar.tpl instances :)

[civibot]

(Standard links)

• If this is your first pull-request for CiviCRM, please browse CONTRIBUTING.md for information about the development and testing processes.
• If you are reviewing this pull-request, you may wish to consult the test sites and the Review Standards (long template, short template).

[seamuslee001]

Jenkins re test this please

[seamuslee001]

(CiviCRM Review Template WORD-1.2)

• General standards
  • (r-explain) Pass
  • (r-user) Pass
  • (r-doc) Pass
  • (r-run) Pass confirmed the error that shows and confirmed this fixes the error
• Developer standards
  • (r-tech) Pass
  • (r-code) Pass
  • (r-maint) Pass
  • (r-test) unknown

[seamuslee001]

Adding merge on pass as this works

[colemanw]

Thanks @seamuslee001!!

[seamuslee001]

Jenkins re test this please