keymap: remove key_redirect struct

The file src/xkbcomp/action.c already doesn't handle this action type
and fails if it encounters it. So lets not pretend to do something with
it, and ignore it rather than failing.

If we/someone wants this we can consider implementing it if possible.

Signed-off-by: Ran Benita <ran234@gmail.com>
wip

Signed-off-by: Ran Benita <ran234@gmail.com>