removes redundant args from Shredder::try_recovery (#21226)

Shredder::try_recovery is already taking a Vec<Shred> as an argument. All the
other arguments are embedded in the shreds, and are so redundant.

core/benches/shredder.rs

@@ -148,14 +148,7 @@ fn bench_shredder_decoding(bencher: &mut Bencher) {
         true, // is_last_in_slot
     );
     bencher.iter(|| {
-        Shredder::try_recovery(
-            coding_shreds[..].to_vec(),
-            symbol_count,
-            symbol_count,
-            0, // first index
-            1, // slot
-        )
-        .unwrap();
+        Shredder::try_recovery(coding_shreds[..].to_vec()).unwrap();
     })
 }