znt: optimizations for zsh<=5.2, use $BUFFER if cmd is not from history

plugins/zsh-navigation-tools/.config/znt/n-cd.conf

@@ -1,4 +1,5 @@
 # Hotlist
+# Try to use $ZSH_VERSION, e.g. /usr/share/zsh/$ZSH_VERSION/functions
 local hotlist
 hotlist=(
     ~/.config/znt
@@ -7,7 +8,6 @@ hotlist=(
     /usr/local/share/zsh/site-functions
     /usr/local/share/zsh
     /usr/local/bin
-    /usr/lib
 )
 
 # Suppress adding (to directory stack) directories visited by n-cd