Bug 26727: Fix <p/> appearing in the templates

Bug 26727: Fix <p/> appearing in the templates

The self-closing p is not valid in HTML5:

Error: Self-closing syntax (/>) used on a non-void HTML element.
Ignoring the slash and treating as a start tag.

To test:

1)
- Activate Article requests
- Search for a record to place an article request on in staff
- Look up the patron
- Verify the article request form looks ok
2)
- Search for a list of patrons
- Check 2 patrons and merge them using the button above the list
- Verify the distance between the button and the table looks ok
3)
- Create a new MARC modification template
- Create a new action
- Verify the distances between the first and second line of form
  elements looks ok
4)
- Place a hold in staff
- Click on the Suspend link in the holds table (not below)
- Verify the modal looks ok

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>