Revert "ethdb/pebble: use sync mode for pebble writes (ethereum#27615)"

This reverts commit e1e0b1c.

ethdb/pebble/pebble.go

@@ -279,7 +279,7 @@ func (d *Database) Put(key []byte, value []byte) error {
 	if d.closed {
 		return pebble.ErrClosed
 	}
-	return d.db.Set(key, value, pebble.Sync)
+	return d.db.Set(key, value, pebble.NoSync)
 }
 
 // Delete removes the key from the key-value store.