Avoid double-assignment of _prompt_giddie_symbol by using different hooks

modules/prompt/functions/prompt_giddie_setup

@@ -21,7 +21,7 @@ function +vi-set_vcs_prompt_symbol() {
 function +vi-set_novcs_prompt_symbol() {
   _prompt_giddie_symbol=')'
 }
-function +vi-set_extra_prompt_data() {
+function +vi-set_extra_git_prompt_data() {
   # Check for untracked files, since vcs_info does not.
   if [[ -n $(git ls-files --other --exclude-standard 2> /dev/null) ]]; then
     hook_com[unstaged]+='%F{green}?%f'
@@ -41,6 +41,7 @@ function prompt_giddie_setup {
 
   # Load required functions.
   autoload -Uz vcs_info
+  autoload -Uz vcs_info_hookadd
   autoload -Uz add-zsh-hook
 
   # Add hook to set up prompt parameters before each command.
@@ -59,9 +60,9 @@ function prompt_giddie_setup {
   zstyle ':vcs_info:*' unstagedstr '%F{green}!%f'
 
   # Add vcs_info hooks
-  zstyle ':vcs_info:*+start-up:*' hooks set_vcs_prompt_symbol
+  vcs_info_hookadd 'no-vcs' set_novcs_prompt_symbol
-  zstyle ':vcs_info:*+no-vcs:*' hooks set_novcs_prompt_symbol
+  vcs_info_hookadd 'set-message' set_vcs_prompt_symbol
-  zstyle ':vcs_info:git*+set-message:*' hooks set_extra_prompt_data
+  zstyle ':vcs_info:git*+set-message:*' hooks set_extra_git_prompt_data
 
   # Define prompts.
   PROMPT='%(?..%F{red}%B-> [%?]%b%f