git: use color auto for ref names in git log (#5729)

Allow the ref names to have differents colors if they are remote refs
or local refs, and another color for HEAD
(use the same coloring scheme as --decorate option)

plugins/git/git.plugin.zsh

@@ -183,11 +183,11 @@ alias glgg='git log --graph'
 alias glgga='git log --graph --decorate --all'
 alias glgm='git log --graph --max-count=10'
 alias glo='git log --oneline --decorate'
-alias glol="git log --graph --pretty='%Cred%h%Creset -%C(yellow)%d%Creset %s %Cgreen(%cr) %C(bold blue)<%an>%Creset'"
-alias glols="git log --graph --pretty='%Cred%h%Creset -%C(yellow)%d%Creset %s %Cgreen(%cr) %C(bold blue)<%an>%Creset' --stat"
-alias glod="git log --graph --pretty='%Cred%h%Creset -%C(yellow)%d%Creset %s %Cgreen(%ad) %C(bold blue)<%an>%Creset'"
-alias glods="git log --graph --pretty='%Cred%h%Creset -%C(yellow)%d%Creset %s %Cgreen(%ad) %C(bold blue)<%an>%Creset' --date=short"
-alias glola="git log --graph --pretty='%Cred%h%Creset -%C(yellow)%d%Creset %s %Cgreen(%cr) %C(bold blue)<%an>%Creset' --all"
+alias glol="git log --graph --pretty='%Cred%h%Creset -%C(auto)%d%Creset %s %Cgreen(%cr) %C(bold blue)<%an>%Creset'"
+alias glols="git log --graph --pretty='%Cred%h%Creset -%C(auto)%d%Creset %s %Cgreen(%cr) %C(bold blue)<%an>%Creset' --stat"
+alias glod="git log --graph --pretty='%Cred%h%Creset -%C(auto)%d%Creset %s %Cgreen(%ad) %C(bold blue)<%an>%Creset'"
+alias glods="git log --graph --pretty='%Cred%h%Creset -%C(auto)%d%Creset %s %Cgreen(%ad) %C(bold blue)<%an>%Creset' --date=short"
+alias glola="git log --graph --pretty='%Cred%h%Creset -%C(auto)%d%Creset %s %Cgreen(%cr) %C(bold blue)<%an>%Creset' --all"
 alias glog='git log --oneline --decorate --graph'
 alias gloga='git log --oneline --decorate --graph --all'
 alias glp="_git_log_prettily"