Config: change ctrl-k to cuttolineend event (#13801)

# Description
According to emacs doc, I think `ctrl-k` should map to `cuttolineend`.

# User-Facing Changes
`ctrl-k` will no longer cut to the end of buffer

crates/nu-utils/src/sample_config/default_config.nu

@@ -756,7 +756,7 @@ $env.config = {
             modifier: control
             keycode: char_k
             mode: emacs
-            event: { edit: cuttoend }
+            event: { edit: cuttolineend }
         }
         {
             name: cut_line_from_start