Bug 42781: Declare 'name' before using it in patron-format.js

The code in koha-tmpl/intranet-tmpl/prog/js/patron-format.js uses
a variable called 'name' without declaring it first. The declaration
was removed in bug 32176. No deterioration of functionality has been
discovered in connection with this, but the declaration should be
restored.

To test:
- Apply the patch.
- HidePatronName = Show
- Look at the staff detail view for a record that has at least one
  item on loan.
- Verify the name of the patron is displayed as expected.

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Jan Kissig <bibliothek@th-wildau.de>
Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>
(cherry picked from commit 7b02715f4f)
Signed-off-by: Baptiste Wojtkowski <baptiste.wojtkowski@biblibre.com>

koha-tmpl/intranet-tmpl/prog/js/patron-format.js

@@ -20,6 +20,7 @@
                 "</span>";
         }
 
+        var name;
         var firstname = escape_str(patron.firstname);
         var preferred_name = escape_str(patron.preferred_name);
         var surname = escape_str(patron.surname);