derive specific ReadOptions for iterators

Signed-off-by: Jason Volk <jason@zemos.net>

src/database/map/keys_from.rs

@@ -46,7 +46,7 @@ where
 {
 	use crate::pool::Seek;
 
-	let opts = super::read_options_default();
+	let opts = super::iter_options_default();
 	let state = stream::State::new(&self.db, &self.cf, opts);
 	let seek = Seek {
 		map: self.clone(),