[FIX] hr_expense: missing dependency

Before this commit, it was not possible to install hr_expense alone.
This commit enable the installation of standalone hr_expense by adding
missing dependency.

closes odoo/odoo#115140

Signed-off-by: Nicolas Viseur (vin) <vin@odoo.com>

addons/hr_expense/__manifest__.py

@@ -26,7 +26,7 @@ The whole flow is implemented as:
 This module also uses analytic accounting and is compatible with the invoice on timesheet module so that you are able to automatically re-invoice your customers' expenses if your work by project.
     """,
     'website': 'https://www.odoo.com/app/expenses',
-    'depends': ['account', 'web_tour'],
+    'depends': ['account', 'web_tour', 'hr'],
     'data': [
         'security/hr_expense_security.xml',
         'security/ir.model.access.csv',