prepare_delivery.sh: Remove dependency on readme_split_rendering.txt
This is a follow-up to #1090 (closed): After ther merge of !1559 (merged), the dependency on readme_split_rendering.txt needs to be removed from prepare_delivery.sh
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This is a follow-up to #1090 (closed): After ther merge of !1559 (merged), the dependency on readme_split_rendering.txt needs to be removed from prepare_delivery.sh