Revert "customs/key-bindings.zsh: added"

This reverts commit cd96842c39.

customs/key-bindings.zsh

@@ -1,11 +0,0 @@
-if zstyle -t ':prezto:module:editor' key-bindings 'emacs' 'vi'; then
-  for keymap in 'emacs' 'viins'; do
-    bindkey -M "$keymap" "\EOw" beginning-of-line
-    bindkey -M "$keymap" "\EOq" end-of-line
-    bindkey -M "$keymap" "\EOt" backward-char
-    bindkey -M "$keymap" "\EOv" forward-char
-    bindkey -M "$keymap" "\EOx" up-line-or-history
-    bindkey -M "$keymap" "\EOr" down-line-or-history
-  done
-fi
-unset keymap