checkMultiExtension in com.alibaba.dubbo.config.AbstractInterfaceConfig should be in setter instead of getter

[beiwei30]

checkMultiExtension in com.alibaba.dubbo.config.AbstractInterfaceConfig should be in setter instead of getter

    @Parameter(key = Constants.INVOKER_LISTENER_KEY, append = true)
    public String getListener() {
        checkMultiExtension(InvokerListener.class, "listener", listener);
        return listener;
    }

    public void setListener(String listener) {
        this.listener = listener;
    }