Fix quoting in bashum handlers

dotfiles/config/bashum/post.bashrc

     #
     local mode=${1:-normal}
     case $mode:$PWD in
-        shrinky:*)              __bashum__shrinkypath "$PWD" ;;
-        normal:*)               echo "${PWD/$HOME/\~}" ;;
-        short:$HOME)            echo "~" ;;
-        short:$HOME/??????????) echo "${PWD/$HOME/\~}" ;;
-        short:$HOME/*/*)        echo "…${PWD##*/}" ;;
-        short:$HOME/*)          echo "${PWD/$HOME/\~}" ;;
-        short:*)                echo "$PWD" ;;
+        shrinky:*)                  __bashum__shrinkypath "$PWD" ;;
+        normal:*)                   echo "${PWD/$HOME/\~}" ;;
+        short:"$HOME")              echo "~" ;;
+        short:"$HOME"/??????????)   echo "${PWD/$HOME/\~}" ;;
+        short:"$HOME"/*/*)          echo "…${PWD##*/}" ;;
+        short:"$HOME"/*)            echo "${PWD/$HOME/\~}" ;;
+        short:*)                    echo "$PWD" ;;
     esac
 }
 
     #
     local path=$1
     case $path in
-        $HOME)      echo "~"; return ;;
-        $HOME/*)    echo -n "~"; __bashum__shrink_relpath "${path#$HOME/}" ;;
+        "$HOME")    echo "~"; return ;;
+        "$HOME"/*)  echo -n "~"; __bashum__shrink_relpath "${path#$HOME/}" ;;
         *)          echo "$path"; return ;;
     esac
 }