Fix the spectrum_ls implementation in spectrum.zsh

lib/spectrum.zsh

@@ -25,13 +25,13 @@ ZSH_SPECTRUM_TEXT=${ZSH_SPECTRUM_TEXT:-Arma virumque cano Troiae qui primus ab o
 # Show all 256 colors with color number
 function spectrum_ls() {
   for code in {000..255}; do
-    print -P -- "$code: %F{$code}$ZSH_SPECTRUM_TEXT%f"
+    print -P -- "$code: %{$FG[$code]%}$ZSH_SPECTRUM_TEXT%{$reset_color%}"
   done
 }
 
 # Show all 256 colors where the background is set to specific color
 function spectrum_bls() {
   for code in {000..255}; do
-    print -P -- "$BG[$code]$code: $ZSH_SPECTRUM_TEXT %{$reset_color%}"
+    print -P -- "$code: %{$BG[$code]%}$ZSH_SPECTRUM_TEXT%{$reset_color%}"
   done
 }