Bug 30950: Remove timepicker.inc

Bug 30950: Remove timepicker.inc

No longer used since
  commit de2d8ba3e4f611aadc29165a7748cc1797d87ce3
  Bug 30011: Update links to jQueryUI assets, remove datepicker references, etc.

We must remove it from our codebase.

Test plan:
  git grep timepicker.inc
Should not return occurrences outside of PO's

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Victor Grousset/tuxayo <victor@tuxayo.net>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
(cherry picked from commit 75bd5cfda14c2ddc7dfdb2939e0f67f3cb302c42)

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