Fixed Group input with depth=0->depth=1 connection failing
Fixed Group input with depth=0->depth=1 connection failing

Groups casts inputs as Variants. Variants are never wrapped
to depth=1, so we need to get the wrapped value and pass it
on before the type information is lost.

core/modules/sub_module.py:
 - Group.compute:
   Get the final value using get_input so that it is wrapped correctly.

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