[zsh] Get rid of a unicode character

This character was causing some issues in Kitty. The terminal would get confused
about the length of RPROMPT when it showed up.

zsh/zshrc.org

@@ -200,8 +200,8 @@ Autoload any ZSH function from =$HOME/.zsh/functions=.
     zstyle ':vcs_info:*' nvcsformats ''
     zstyle ':vcs_info:bzr:*' branchformat '%b'
     zstyle ':vcs_info:git:*' check-for-changes 1
-    zstyle ':vcs_info:*' stagedstr '%F{2}Δ%f'
-    zstyle ':vcs_info:*' unstagedstr '%F{1}Δ%f'
+    zstyle ':vcs_info:*' stagedstr '%F{2}*%f'
+    zstyle ':vcs_info:*' unstagedstr '%F{1}*%f'
   #+end_src
 
   Set the actual prompts.