[Form] Fix choice keys and values for custom field types #7940
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Choices labels are defined as the keys of the array as of Symfony 3 (see symfony/symfony#14050).
I prefered to keep the same parameters for the "Creating your Field Type as a Service" section and call
array_flip
as I think it is clearer to keep the keys as keys (!) for parameters, especially as the labels could contain some spaces.