erlang: Remove unecessary 'throw(short)' clause for unpack_{array,map}_/1

Unecessary because unpack_/1 will throw it anyway.
This does mean that we go a tiny bit deeper to find that we don't have enough data,
but that should be a rare code path. Keep the main code path fast and the code clean.

While at it, rename vars to match its sibling function and to avoid thinking that
RestLen is a byte count (it's an item count).

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