Reinstate raw receive check when truncating

This patch re-adds a check that was removed in 369aa50. The check
confirms that a raw receive is not occuring before truncating an
object's dn_maxblkid. At the time, it was believed that all cases
that would hit this code path would be handled in other places,
but that was not the case.

Reviewed-by: Matt Ahrens <[email protected]>
Reviewed-by: Paul Dagnelie <[email protected]>
Reviewed-by: Brian Behlendorf <[email protected]>
Signed-off-by: Tom Caputi <[email protected]>
Closes #8852 
Closes #8857 

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