Fix:Redis configuration template error in v0.22.1 (#12685)

### What problem does this PR solve?
https://github.com/infiniflow/ragflow/issues/12674

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

rag/utils/redis_conn.py

@@ -125,8 +125,8 @@ class RedisDB:
     def __open__(self):
         try:
             conn_params = {
-                "host": self.config["host"].split(":")[0],
-                "port": int(self.config.get("host", ":6379").split(":")[1]),
+                "host": self.config["host"],
+                "port": int(self.config.get("port", 6379)),
                 "db": int(self.config.get("db", 1)),
                 "decode_responses": True,
             }