Bug 16752 [Revised] Remove the use of event attributes from some acquisitions templat...

Bug 16752 [Revised] Remove the use of event attributes from some acquisitions templates - Uncertain prices

This patch modifies the acquisitions uncertain prices template to remove
event attributes onclick and onchange.

Also changed on the uncertain prices page: Added a label to the orders
filter, removed redundant form submit function.

- Locate a vendor which has orders with uncertain prices
- Click the 'Uncertain prices' tab in the left-hand sidebar
- Enter invalid data in the "price" field for any order. Confirm that an
  error is triggered when the field loses focus.

Signed-off-by: Aleisha Amohia <aleishaamohia@hotmail.com>
QA Revision: Corrected input type of submit button.

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>