fix(dynamodb): stacks created by GlobalTable correctly inherit their account

[skinny85]

If an account was specified on the main stack,
the child stacks created by GlobalTable were env-agnostic,
which means it wasn't possible to have a reference between a global table instance,
and anything in the main stack, even if they were in the same region.

Fixes #4882

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[eladb]

Nit: the PR title should have describe the bug, not the solution. So basically "stacks created by global table do not inherit account"