zsh:glog: Move header into variable

.config/zsh/autoload/git/glog

@@ -132,13 +132,21 @@ local -A binds=(
 #       fzf_preview[stat] in this case). It does not really make sense to pass
 #       it to `git log` but can be an indicator for the preview function
 
+local color_brown=$'\e[38;5;144m'
+local color_grey=$'\e[38;5;59m'
+local header=""
+header+="${color_brown}Enter${color_grey}: fullscreen, "
+header+="${color_brown}C-y${color_grey}: yank hash, "
+header+="${color_brown}C-Space${color_grey}: cycle preview, "
+header+="${color_brown}C-[spf]${color_grey}: preview stats/patch/files"
+
 local -a fzf_args=(
 	# Understand ansi color escape sequences.
 	"--ansi"
 	# Expand the binds array in the format "key1:value1,key2:value2".
 	"--bind" "${(@kj:,:)binds/(#m)*/$MATCH:$binds[$MATCH]}"
 	# Display key-bindings in a sticky header
-	"--header" $'\e[38;5;144mEnter\e[38;5;59m: fullscreen, \e[38;5;144mC-y\e[38;5;59m: yank hash, \e[38;5;144mC-Space\e[38;5;59m: cycle preview, \e[38;5;144mC-[spf]\e[38;5;59m: preview stats/patch/files'
+	"--header" "$header"
 	# Keep header above prompt line
 	"--header-first"
 	# Execute git show on the commit as preview.