Remove unused import statement

Author: teetangh

src/main/java/org/couchbase/quickstart/springboot/controllers/AirportController.java

@@ -16,7 +16,6 @@
 import org.springframework.web.bind.annotation.PutMapping;
 import org.springframework.web.bind.annotation.RequestBody;
 import org.springframework.web.bind.annotation.RequestMapping;
-import org.springframework.web.bind.annotation.RequestParam;
 import org.springframework.web.bind.annotation.RestController;
 
 import com.couchbase.client.core.error.DocumentExistsException;