[FIX] database_cleanup: ignore to_buy modules

Since 12.0, some virtual modules are created as an incentive to buy enterprise
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database_cleanup/models/purge_modules.py

@@ -63,8 +63,9 @@ class CleanupPurgeWizardModule(models.TransientModel):
     @api.model
     def find(self):
         res = []
-        for module in self.env['ir.module.module'].search([]):
+        IrModule = self.env['ir.module.module']
-            if get_module_path(module.name):
+        for module in IrModule.search([('to_buy', '=', False)]):
+            if get_module_path(module.name, display_warning=False):
                 continue
             if module.state == 'uninstalled':
                 self.env['cleanup.purge.line.module'].create({