Ingo Schommer 750e81b7cf Remove GroupedDropdownField::validate() (regression)
Regression caused by 41ea83b3374d026da9575f5256a02bdcfbb82059,
which introduced field validation in the parent class without
also adapting this subclass.

Fixing the immediate issue (can't save this field type),
as a first step to the actual fix (implementing validate).

See https://github.com/silverstripe/silverstripe-translatable/issues/179
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