fix: openchat remove -join suffix

Author: supersonictw

020-openchat-join/compose.yml renamed to 020-openchat/compose.yml

@@ -19,7 +19,7 @@ HTTPS_KEY_PATH="/some/where.key"
 HTTPS_CERT_PATH="/some/where.crt"
 
 # database
-MONGODB_URI="$OPENCHAT_JOIN_MONGODB_URI"
+MONGODB_URI="$OPENCHAT_MONGODB_URI"
 
 # cors
 ENABLED_CORS="no" # cors ('yes' or 'no'), CORS_ORIGIN is required