Add missing entries in FILES

Author: jpfinne

samples/server/petstore/springboot-useoneofextensibleenum/.openapi-generator/FILES

@@ -1,11 +1,9 @@
-.openapi-generator-ignore
 README.md
 pom.xml
 src/main/java/org/openapitools/OpenApiGeneratorApplication.java
 src/main/java/org/openapitools/RFC3339DateFormat.java
 src/main/java/org/openapitools/api/ApiUtil.java
 src/main/java/org/openapitools/api/TestApi.java
-src/main/java/org/openapitools/api/TestApiController.java
 src/main/java/org/openapitools/configuration/EnumConverterConfiguration.java
 src/main/java/org/openapitools/configuration/HomeController.java
 src/main/java/org/openapitools/configuration/SpringFoxConfiguration.java