Fix support for field with both enumType and type: enum #299

Job	Run time
Platform test (8.3)	2m 35s
Platform test (7.4)	2m 44s
Platform test (8.0)	2m 37s
Platform test (8.4)	2m 42s
Platform test (8.2)	2m 54s
Platform test (8.1)	2m 40s
Platform test (8.1, doctrine/orm:^3.0 doctrine/dbal:^4.0 carbonphp/carbon-doctrine-types:^3 gedmo...	2m 18s
Platform test (8.2, doctrine/orm:^3.0 doctrine/dbal:^4.0 carbonphp/carbon-doctrine-types:^3 gedmo...	2m 27s
Platform test (8.4, doctrine/orm:^3.0 doctrine/dbal:^4.0 carbonphp/carbon-doctrine-types:^3 gedmo...	2m 19s
Platform test (8.3, doctrine/orm:^3.0 doctrine/dbal:^4.0 carbonphp/carbon-doctrine-types:^3 gedmo...	2m 45s
	26m 1s

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