hlssink3: fix bug with last segment when stopping

Garrett Graves requested to merge GRVYDEV/gst-plugins-rs:fix-hlssink3 into main

This MR fixes a bug with hlssink3 that causes the last segment to never be dereferenced when the pipeline ends. This causes awss3hlssink to never upload the final segment. This fixes #423 (closed)

Edited by Garrett Graves

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