fix missing configuration (openapi-processor/openapi-processor-spring#350)

Author: hauner

openapi-processor-core/src/testInt/kotlin/io/openapiprocessor/core/TestProcessor.kt

@@ -41,7 +41,9 @@ class TestProcessor:
 
             val options = convertOptions(processorOptions)
             apiOptions = options
-            val identifier = JavaIdentifier(IdentifierOptions(options.identifierWordBreakFromDigitToLetter))
+            val identifier = JavaIdentifier(IdentifierOptions(
+                options.identifierWordBreakFromDigitToLetter,
+                options.identifierPrefixInvalidEnumStart))
             val cv = ApiConverter(options, identifier, FrameworkBase())
             val api = cv.convert(openapi)