[Fix #263] Revert "Ensure that $terminfo values are valid"

The VT100 terminal application mode is an old relic that is no longer
needed.

This reverts commit a5f8d04d34.

modules/editor/init.zsh

@@ -136,23 +136,8 @@ function editor-info {
 }
 zle -N editor-info
 
-# Ensures that $terminfo values are valid and updates editor information when
-# the keymap changes.
+# Updates editor information when the keymap changes.
 function zle-keymap-select zle-line-init zle-line-finish {
-  # The terminal must be in application mode when ZLE is active for $terminfo
-  # values to be valid.
-  case "$0" in
-    (zle-line-init)
-      # Enable terminal application mode.
-      echoti smkx
-    ;;
-    (zle-line-finish)
-      # Disable terminal application mode.
-      echoti rmkx
-    ;;
-  esac
-
-  # Update editor information.
   zle editor-info
 }
 zle -N zle-keymap-select