fix enum type generators template

[sbilello]

@frantuma Performed Rebase and commit squash.

mvn test
[INFO] Results:
[INFO] 
[INFO] Tests run: 225, Failures: 0, Errors: 0, Skipped: 0
[INFO] 
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  11.562 s
[INFO] Finished at: 2021-10-11T10:17:36-07:00

[frantuma]

thanks!

[sbilello]

Could we also merge swagger-api/swagger-codegen#11219 please? Thanks!

…

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