Fix bridge/config topic. https://github.com/Koenkk/zigbee2mqtt/issues/626

lib/extension/bridgeConfig.js

@@ -140,7 +140,7 @@ class BridgeConfig {
     }
 
     publish() {
-        const topic = `${settings.get().mqtt.base_topic}/bridge/config`;
+        const topic = `bridge/config`;
         const payload = {
             log_level: logger.transports.console.level,
             permit_join: this.zigbee.getPermitJoin(),