lib: clean up zsh_stats function

lib/functions.zsh

 function zsh_stats() {
-  fc -l 1 | awk '{CMD[$2]++;count++;}END { for (a in CMD)print CMD[a] " " CMD[a]/count*100 "% " a;}' | grep -v "./" | column -c3 -s " " -t | sort -nr | nl |  head -n20
+  fc -l 1 \
+    | awk '{ CMD[$2]++; count++; } END { for (a in CMD) print CMD[a] " " CMD[a]*100/count "% " a }' \
+    | grep -v "./" | sort -nr | head -n20 | column -c3 -s " " -t | nl
 }
 
 function uninstall_oh_my_zsh() {