fix docker-compose.yml bug

Author: OldDream666

docker-compose.yml

@@ -12,7 +12,7 @@ services:
       - BASE_URL=$BASE_URL
       - OPENAI_ORG_ID=$OPENAI_ORG_ID
       - HIDE_USER_API_KEY=$HIDE_USER_API_KEY
-      - DISABLE_GPT4=DISABLE_GPT4
+      - DISABLE_GPT4=$DISABLE_GPT4
 
   chatgpt-next-web-proxy: 
     profiles: ["proxy"]
@@ -27,4 +27,4 @@ services:
       - BASE_URL=$BASE_URL
       - OPENAI_ORG_ID=$OPENAI_ORG_ID
       - HIDE_USER_API_KEY=$HIDE_USER_API_KEY
-      - DISABLE_GPT4=$DISABLE_GPT4
+      - DISABLE_GPT4=$DISABLE_GPT4