Fix tilde substitution in theme prompts

These themes used an adhoc substitution of $HOME for tilde
in $PWD, but it's better to use '%~' and is less error prone.

See #7160

themes/amuse.zsh-theme

@@ -9,7 +9,7 @@ rbenv_version() {
 }
 
 PROMPT='
-%{$fg_bold[green]%}${PWD/#$HOME/~}%{$reset_color%}$(git_prompt_info) ⌚ %{$fg_bold[red]%}%*%{$reset_color%}
+%{$fg_bold[green]%}%~%{$reset_color%}$(git_prompt_info) ⌚ %{$fg_bold[red]%}%*%{$reset_color%}
 $ '
 
 # Must use Powerline font, for \uE0A0 to render.

themes/candy-kingdom.zsh-theme

@@ -17,7 +17,7 @@ function box_name {
 }
 
 PROMPT='
-%{$fg[magenta]%}%n%{$reset_color%}@%{$fg[yellow]%}$(box_name)%{$reset_color%}:%{$fg_bold[green]%}${PWD/#$HOME/~}%{$reset_color%}$(hg_prompt_info)$(git_prompt_info)
+%{$fg[magenta]%}%n%{$reset_color%}@%{$fg[yellow]%}$(box_name)%{$reset_color%}:%{$fg_bold[green]%}%~%{$reset_color%}$(hg_prompt_info)$(git_prompt_info)
 %(?,,%{${fg_bold[white]}%}[%?]%{$reset_color%} )$ '
 
 ZSH_THEME_GIT_PROMPT_PREFIX=" (%{$fg[magenta]%}branch: "

themes/dstufft.zsh-theme

@@ -9,7 +9,7 @@ function virtualenv_info {
 }
 
 PROMPT='
-%{$fg[magenta]%}%n%{$reset_color%} at %{$fg[yellow]%}%m%{$reset_color%} in %{$fg_bold[green]%}${PWD/#$HOME/~}%{$reset_color%}$(git_prompt_info)
+%{$fg[magenta]%}%n%{$reset_color%} at %{$fg[yellow]%}%m%{$reset_color%} in %{$fg_bold[green]%}%~%{$reset_color%}$(git_prompt_info)
 $(virtualenv_info)$(prompt_char) '
 
 ZSH_THEME_GIT_PROMPT_PREFIX=" on %{$fg[magenta]%}"

themes/fino-time.zsh-theme

@@ -30,11 +30,10 @@ if type rvm-prompt &>/dev/null; then
     rvm_ruby='using%{$FG[243]%}‹$(rvm-prompt i v g)›%{$reset_color%}'
 fi
 
-local current_dir='${PWD/#$HOME/~}'
 local git_info='$(git_prompt_info)'
 
 
-PROMPT="╭─%{$FG[040]%}%n%{$reset_color%} %{$FG[239]%}at%{$reset_color%} %{$FG[033]%}$(box_name)%{$reset_color%} %{$FG[239]%}in%{$reset_color%} %{$terminfo[bold]$FG[226]%}${current_dir}%{$reset_color%}${git_info} %{$FG[239]%}${rvm_ruby} %D - %*
+PROMPT="╭─%{$FG[040]%}%n%{$reset_color%} %{$FG[239]%}at%{$reset_color%} %{$FG[033]%}$(box_name)%{$reset_color%} %{$FG[239]%}in%{$reset_color%} %{$terminfo[bold]$FG[226]%}%~%{$reset_color%}${git_info} %{$FG[239]%}${rvm_ruby} %D - %*
 ╰─$(virtualenv_info)$(prompt_char) "
 
 ZSH_THEME_GIT_PROMPT_PREFIX=" %{$FG[239]%}on%{$reset_color%} %{$fg[255]%}"

themes/fino.zsh-theme

@@ -29,12 +29,11 @@ else
   fi
 fi
 
-local current_dir='${PWD/#$HOME/~}'
 local git_info='$(git_prompt_info)'
 local prompt_char='$(prompt_char)'
 
 
-PROMPT="╭─%{$FG[040]%}%n%{$reset_color%} %{$FG[239]%}at%{$reset_color%} %{$FG[033]%}$(box_name)%{$reset_color%} %{$FG[239]%}in%{$reset_color%} %{$terminfo[bold]$FG[226]%}${current_dir}%{$reset_color%}${git_info} %{$FG[239]%}${ruby_env}
+PROMPT="╭─%{$FG[040]%}%n%{$reset_color%} %{$FG[239]%}at%{$reset_color%} %{$FG[033]%}$(box_name)%{$reset_color%} %{$FG[239]%}in%{$reset_color%} %{$terminfo[bold]$FG[226]%}%~%{$reset_color%}${git_info} %{$FG[239]%}${ruby_env}
 ╰─${prompt_char}%{$reset_color%} "
 
 ZSH_THEME_GIT_PROMPT_PREFIX=" %{$FG[239]%}on%{$reset_color%} %{$fg[255]%}"