Revert "fix: DecideBackendByTargetIdP clean up"

This reverts commit a0a5c11.

Author: peppelinux

src/satosa/micro_services/custom_routing.py

@@ -88,6 +88,7 @@ def process(self, context:Context, data:dict):
 
     def _rewrite_context(self, entity_id:str, context:Context) -> None:
         tr_backend = self._get_backend(context, entity_id)
+        context.decorate(Context.KEY_TARGET_ENTITYID, entity_id)
         context.target_frontend = context.target_frontend or context.state.get('ROUTER')
         native_backend = context.target_backend
         msg = (f'Found DecideBackendByTarget ({self.name} microservice) '