Update bira theme (#4954)

* Add '#' instead of '$' when in root
* Make return code bold

themes/bira.zsh-theme

@@ -4,8 +4,10 @@ local return_code="%(?..%{$fg[red]%}%? ↵%{$reset_color%})"
 
 if [[ $UID -eq 0 ]]; then
     local user_host='%{$terminfo[bold]$fg[red]%}%n@%m%{$reset_color%}'
+    local user_symbol='#'
 else
     local user_host='%{$terminfo[bold]$fg[green]%}%n@%m%{$reset_color%}'
+    local user_symbol='$'
 fi
 
 local current_dir='%{$terminfo[bold]$fg[blue]%} %~%{$reset_color%}'
@@ -20,8 +22,9 @@ fi
 local git_branch='$(git_prompt_info)%{$reset_color%}'
 
 PROMPT="╭─${user_host} ${current_dir} ${rvm_ruby} ${git_branch}
-╰─%B$%b "
-RPS1="${return_code}"
+╰─%B${user_symbol}%b "
+RPS1="%B${return_code}%b"
 
 ZSH_THEME_GIT_PROMPT_PREFIX="%{$fg[yellow]%}‹"
 ZSH_THEME_GIT_PROMPT_SUFFIX="› %{$reset_color%}"
+