Bug 34624: Add "for" attribute to label in header search forms which lack it

Bug 34624: Add "for" attribute to label in header search forms which lack it

This patch adds a "for" label to header search forms labels which lack
it.

To test, apply the patch and test the affected pages to confirm that
clicking the label corresponding to the active search form can be
clicked to move cursor focus to that input field.

As you activate each search form, the cursor focus will automatically be
moved to the input. Click outside of the field to remove the focus, and
then click the label to test that it is correctly tied to the field.

- Staff interface home page:
  - Checkout, Check in, Renew, Search patrons, and Search catalog.
- Acquisitions: Vendor search and orders search
- Acquisitions -> Vendor search -> Vendor -> Contracts: Contract search
- Acquisitions -> Vendor search -> Vendor -> Basket -> Add to basket ->
  From a suggestion: Search suggestions
- Authorities: Main heading ($a only), Main heading, All headings, and
  Entire record.
- Administration -> Budgets: Search funds
- Administration -> Cities & towns: City search
- Administration -> Currencies: Currencies search
- Administration -> Desks: Search desks
  * With UseCirculationDesks enabled
- Administration -> Patron categories: Search patron categories
- Administration -> System preferences: Search system preferences
- Administration -> Z39.50 servers -> Z39.50 server search
- Cataloging: Cataloging search
- E-resource management: Search agreements, Search licenses, Search
  packages, and Search titles
  * With ERMModule enabled
- Patrons -> Search patrons
- Serials: Search subscriptions
- Tools -> Notices & slips: Search notices

Signed-off-by: Pedro Amorim <pedro.amorim@ptfs-europe.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>