txg_sync should handle write errors in ZIL

The txg_sync thread will see certain buffers in a DR_IN_DMU_SYNC state
when ZIL is writing them out. Then it waits until the state changes, but
has an assertion to check that they were not DR_NOT_OVERRIDDEN. If the
data write failed with an error, ZIL will put it into the
DR_NOT_OVERRIDDEN state. It looks like the code will handle that state
without an issue, so we can just delete the assertion.

Reviewed-by: Brian Behlendorf <[email protected]>
Signed-off-by: Richard Yao <[email protected]>
Sponsored-By: Wasabi Technology, Inc.
Closes #14283 

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