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vinyl: fix memory leak on error decoding row during compaction

Just add missing `vy_page_delete()` to `vy_slice_stream_search()`.

The error is very unlikely to happen because:
 - `vy_slice_stream_search()` is called only once during a compaction
   task execution.
 - Memory leaks if `vy_page_find_key()` fails to decode a statement.
   Practically, this can only occur on memory allocation error.
   In tests it's triggered by an error injection.

Closes #11044

NO_DOC=bug fix
NO_TEST=caught by existing test now and then
NO_CHANGELOG=minor; shouldn't normally happen

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