[FIX] hr_expense_check: remove duplicate key in manifest

The 'category' key is already present in the manifest.
This duplicated key makes odoo create a new module
category, with a bad xml id
(module_category_accounting_andamp;_finance), since
the ampersand was escaped.

addons/hr_expense_check/__manifest__.py

@@ -6,7 +6,6 @@
     'description': """
         Print amount in words on checks issued for expenses
     """,
-    'category': 'Accounting & Finance',
     'version': '1.0',
     'depends': ['account_check_printing', 'hr_expense'],
     'auto_install': True,