[Java] Replace `if` with `?` in Generated `toIndentedString`-methods … #1142

Job	Run time
Build with JDK17 (samples/client/petstore/spring-http-interface-reactive-noResponseEntity)	49s
Build with JDK17 (samples/openapi3/client/petstore/spring-cloud-3)	50s
Build with JDK17 (samples/client/petstore/spring-http-interface-reactive)	48s
Build with JDK17 (samples/client/petstore/java-helidon-client/v3/se)	39s
Build with JDK17 (samples/client/petstore/spring-http-interface)	50s
Build with JDK17 (samples/client/petstore/java-helidon-client/v3/mp/)	45s
Build with JDK17 (samples/client/petstore/spring-http-interface-useHttpServiceProxyFactoryInterfa...	41s
Build with JDK17 (samples/client/petstore/spring-http-interface-noResponseEntity)	48s
Build with JDK17 (samples/client/petstore/java/webclient-jakarta)	49s
Build with JDK17 (samples/server/petstore/springboot-x-implements-skip)	50s
Build with JDK17 (samples/openapi3/server/petstore/springboot-3-include-http-request-context)	54s
Build with JDK17 (samples/server/petstore/java-helidon-server/v3/se)	43s
Build with JDK17 (samples/server/petstore/java-camel/)	56s
Build with JDK17 (samples/server/petstore/java-helidon-server/v3/mp/)	50s
Build with JDK17 (samples/client/petstore/java/microprofile-rest-client-outer-enum)	58s
Build with JDK17 (samples/openapi3/server/petstore/springboot-3)	57s
	13m 7s

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