[FAL-23] Enable ORGANIZATIONS_APP feature flag by default.

It is required to be able to set up custom certificate templates.

instance/models/mixins/openedx_config.py

@@ -254,6 +254,7 @@ def _get_configuration_variables(self):
                 "ENABLE_THIRD_PARTY_AUTH": True,
                 "ENABLE_XBLOCK_VIEW_ENDPOINT": True,
                 "ENABLE_SYSADMIN_DASHBOARD": True,
+                "ORGANIZATIONS_APP": True,
                 "PREVIEW_LMS_BASE": self.instance.lms_preview_domain,
                 "REQUIRE_COURSE_EMAIL_AUTH": False,
                 "USE_MICROSITES": False,