Kitty-keyboard-protocol causes Backspace to delete 2 characters.

[gyreas]

Hi,
I'm trying out Rio first time, so after installation, I enabled some fancy-looking options, after which backspace begins to delete 2 characters instead of one. By process of elimination, use-kitty-keyboard-protocol = true turned out to be the culprit, without which the default value false works well.

To reproduce:

1. Create a temp config with cursor, blinking-cursor, use-kitty-keyboard-protocol=true and performance="high" options set
2. Open a new Rio with that config
3. Type some random characters on the cmdline and press backspace once
   Observation: Two characters before the cursor are deleted.
   Expected Outcome: The character before the cursor is deleted.

[raphamorim]

@gyreas thanks for the issue, are you using Rio in which version and platform?

[raphamorim]

Should be fixed after @hougesen fix, let me know anything