Removed redundant override of the configure method

Since the `SampleJerseyApplication` class is already passed in the
`SpringApplicationBuilder` constructor, there is no need to override the
configure method of the `SpringBootServletInitializer` class.

Closes gh-5773

spring-boot-samples/spring-boot-sample-jersey/src/main/java/sample/jersey/SampleJerseyApplication.java

@@ -23,11 +23,6 @@ import org.springframework.boot.context.web.SpringBootServletInitializer;
 @SpringBootApplication
 public class SampleJerseyApplication extends SpringBootServletInitializer {
 
-	@Override
-	protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
-		return application.sources(SampleJerseyApplication.class);
-	}
-
 	public static void main(String[] args) {
 		new SampleJerseyApplication()
 				.configure(new SpringApplicationBuilder(SampleJerseyApplication.class))