decklink: Fix crash during shutdown when output is on

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The actual crash is caused because obs_module_unload() is called before
the decklink outputs are stopped. In obs_module_unload(), the deviceEnum
pointer is freed. During decklink_output_stop(), the removed code tries
to retrieve a reference of the decklink device from the deviceEnum and
crashes because it has already been freed. This code appears to serve no
purpose anyway, so we remove it.

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