Remove no longer necessary key bindings

modules/history-substring-search/init.zsh

@@ -24,23 +24,3 @@ if ! zstyle -t ':prezto:module:history-substring-search' color; then
   unset HISTORY_SUBSTRING_SEARCH_HIGHLIGHT_{FOUND,NOT_FOUND}
 fi
 
-#
-# Key Bindings
-#
-
-if [[ -n $key_info ]]; then
-  # Emacs
-  bindkey -M emacs "$key_info[Control]P" history-substring-search-up
-  bindkey -M emacs "$key_info[Control]N" history-substring-search-down
-
-  # Vi
-  bindkey -M vicmd "k" history-substring-search-up
-  bindkey -M vicmd "j" history-substring-search-down
-
-  # Emacs and Vi
-  for keymap in 'emacs' 'viins'; do
-    bindkey -M "$keymap" "$key_info[Up]" history-substring-search-up
-    bindkey -M "$keymap" "$key_info[Down]" history-substring-search-down
-  done
-fi
-