[FIX] account: Enable 'Analytic Accounting' group if 'Budget Management' is enabled

There is no way to use Budgets without Analytics, so it should be enabled at the same time with the option 'module_account_budget
'

addons/account/models/res_config.py

@@ -265,6 +265,11 @@ class AccountConfigSettings(models.TransientModel):
         if self.group_analytic_accounting:
             self.module_account_accountant = True
 
+    @api.onchange('module_account_budget')
+    def onchange_module_account_budget(self):
+        if self.module_account_budget:
+            self.group_analytic_accounting = True
+
     @api.multi
     def open_company(self):
         return {