Removes setting FactoryBean.OBJECT_TYPE_ATTRIBUTE

It was previously ignored, changing it to a class introduces behaviour that breaks aot.

This is required by spring-projects/spring-framework@a6ff95a

Fixes gh-912

Author: spencergibb

spring-cloud-openfeign-core/src/main/java/org/springframework/cloud/openfeign/FeignClientsRegistrar.java

@@ -32,7 +32,6 @@
 import feign.Request;
 
 import org.springframework.aop.scope.ScopedProxyUtils;
-import org.springframework.beans.factory.FactoryBean;
 import org.springframework.beans.factory.annotation.AnnotatedBeanDefinition;
 import org.springframework.beans.factory.annotation.AnnotatedGenericBeanDefinition;
 import org.springframework.beans.factory.config.BeanDefinition;
@@ -291,7 +290,6 @@ private void lazilyRegisterFeignClientBeanDefinition(String className, Map<Strin
 		validate(attributes);
 
 		AbstractBeanDefinition beanDefinition = definition.getBeanDefinition();
-		beanDefinition.setAttribute(FactoryBean.OBJECT_TYPE_ATTRIBUTE, className);
 		beanDefinition.setAttribute("feignClientsRegistrarFactoryBean", factoryBean);
 
 		// has a default, won't be null