Makes history-substring-search use term specific up and down buttons. Fixes #2089.

plugins/history-substring-search/history-substring-search.zsh

@@ -163,8 +163,9 @@ function history-substring-search-down() {
 zle -N history-substring-search-up
 zle -N history-substring-search-down
 
-bindkey '\e[A' history-substring-search-up
+zmodload zsh/terminfo
-bindkey '\e[B' history-substring-search-down
+bindkey "$terminfo[kcuu1]" history-substring-search-up
+bindkey "$terminfo[kcud1]" history-substring-search-down
 
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 # implementation details