Ctrl+y in vi mode not working

### Description

When configured to use vi mode, Ctrl+y doesn't yank the previous cut text.

### Steps to reproduce

1. Add `key_bindings = vi` to your config file
1. Open litecli and type `pragma table_info('albums')`
1. Hit Ctrl+w
1. Hit Ctrl+y

### Expected behavior

Ctrl+w should cut `table_info('albums')` text and Ctrl+y should paste it back

### Actual behavior

Ctrl+w cut the text as intended, but Ctrl+y doesn't do anything.