Remove an unused parameter

Closes gh-3589

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/amqp/RabbitAutoConfiguration.java

@@ -97,7 +97,7 @@ public class RabbitAutoConfiguration {
 
 	@Bean
 	@ConditionalOnMissingBean(RabbitTemplate.class)
-	public RabbitTemplate rabbitTemplate(RabbitProperties config) {
+	public RabbitTemplate rabbitTemplate() {
 		return new RabbitTemplate(this.connectionFactory);
 	}